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1 Graphing Linear Equations Chapter Questions 1. What are the various types of information you can be given to graph a line? 2. What is slope? How is it determined? 3. Why do we need to be careful about the slopes of horizontal and vertical lines? 4. How can we tell is two lines are parallel, perpendicular or neither just from their equations? 5. What are the various ways you can use information given to you to determine the equation of a line? 6. What are the different ways to solve a system of linear equations? 7. When do you get an answer to a system of linear equations that has one solution, no solution and infinitely many solutions? NJ Center for Teaching and Learning ~ 1 ~

2 Graphing Linear Equations Chapter Problems Tables For the equations below, make a table with at least 3 ordered pairs, plot the points and connect them to form the line. 1) y = 3x - 4 2) y = -2x + 4 3) y = x 3 4) y = x + 4 5) y = - x + 1 For the equations below, make a table with at least 3 ordered pairs, plot the points and connect them to form the line. 6) y = -x 2 7) y = 2x + 1 8) y = x 9) y = -2x 2 10) y = - x + 4 Slope and y-intercept 11) Use lines A, B, C and D to fill in the table. Lines y intercept Slope (+, -, 0 or undefined A B C D NJ Center for Teaching and Learning ~ 2 ~

3 12) What is the slope of lines E, F, G and H? Lines slope E F G H 13) What are the equations of lines E, F,G and H? Lines Equation E F G H 14) Use lines I, J, K and L to fill in the table. Lines y intercept Slope (+, -, 0 or undefined I J K L NJ Center for Teaching and Learning ~ 3 ~

4 15) What are the slopes of lines M, N, O and P? Lines slope M N O P 16) What is the equation of lines M, N, O and P? Lines Equation M N O P Slope Formula Find the slope of the line through each of the following two points. 17) (-12,-5), (0,-8) 18) (12,-18),(11,12) 19) (-18,-20),(-18,-15) 20) (-20,-4),(-12,-10) 21) (8,10),(0,14) 22) (6,9),(3,-9) 23) (1,2),(5,7) 24) (3,-3),(12,-2) NJ Center for Teaching and Learning ~ 4 ~

5 25) (-4,-8),(-1,1) 26) (4,7),(-3,7) Find the slope of the line through each of the following two points. 27) (3,-9),(1,1) 28) (7,4),(3,8) 29) (-3,0),(5,12) 30) (8,-2),(12,-2) 31) (6,-3),(2,9) 32) (-3,7),(-4,8) 33) (5,9),(5,-8) 34) (-5, 0.5),(-6,3) 35) (-7,1),(7,8) 36) (-2,1),(5,7) Slope Intercept Form 37) Write the equation for each graph that is for the line. NJ Center for Teaching and Learning ~ 5 ~

6 Which graph represents the following equations? 38) y = ) y = -x ) y = -3/8x 6 41) y = 3/2x graphs. 42) Write the equation that represents the following Which graph represents the following equations? 43) y = -4/5-8 44) y = 8 45) y = 5/4x -1 46) y = -3x + 2 NJ Center for Teaching and Learning ~ 6 ~

7 Rate of Change 47) If a car passes mile-marker 50 in 2 hours and mile-marker 200 in 6 hours, how many miles per hour is the car traveling? 48) A driver sets the cruise controls at 55 miles per hour. After driving for 3 hours, he passes milemarker 650. In 2 hours, what mile-marker will he be passing? 49) Dominique earns \$10 per hour for tutoring students and is given \$15 for gas everyday. Write an equation that represents the situation. 50) Maria spends \$ on groceries in a week but earned \$4000 total at her last job. Write an equation that represents the situation. 51) John has a company that charges \$4/lb. for gourmet candy plus \$7 shipping. If Lisa buys 6 lbs. of candy, how much money will she spend? 52) If a car passes mile-marker 25 in 2 hours and mile-marker 450 in 5 hours, how many miles per hour is the car traveling? 53) A driver sets the cruise controls at 45 miles per hour. After driving for 2 hours, he passes milemarker 20. In 3 hours, what mile-marker will he be passing? 54) Christina earns \$7.50 per hour for tutoring students and is given \$50 for gas everyday. Write an equation that represents the situation. 55) Monique spends \$400 on groceries in a week but earned \$15,000 total at her last job. Write an equation that represents the situation. 56) Timothy has a company that charges \$9/lb. for gourmet candy plus \$7 shipping. If Janice buys 3 lbs. of candy, how much money will she spend? NJ Center for Teaching and Learning ~ 7 ~

8 Proportional Relationships and Graphing For each problem, draw the graph of the relationship between the two quantities & state what the slope is. 57) A maple tree grows 8 inches each year. 58) Coconuts are \$4.50 per pound. 59) Every 5 days, Lilo receives 6 flowers from Stitch. 60) Barney makes 4 pies an hour. 61) Aladdin takes a carpet ride every 5 days. 62) Speed Racer drives a race every 3 years. 63) Brooke puts \$5.00 in her bank account every week. 64) Peyton grades a quiz every 30 seconds. 65) A palm tree grows 2 inches each year. 66) Pineapples are \$2.00 per pound. 67) Every 3 days, Lilo receives 4 flowers from Stitch. 68) Princess Fiona makes 8 puzzles in her tower in 3 hours. 69) Jasmine takes a carpet ride every 3 days. 70) Mach 5 drives a race every 7 days. 71) Hayley puts \$20.00 in her bank account every week. 72) Lucas grades a test every 2 minutes and 30 seconds. Slope & Similar Triangles Find the slope of the hypotenuse from the triangle with the following points. 73) (0,0); (0,4); (7,0) 74) (1,3); (1,7); (-4,3) 75) (-3,2); (-3,3); (-5,3) NJ Center for Teaching and Learning ~ 8 ~

9 76) (1,1); (1,5); (2,5) 77) Find three points that form a triangle that lies on a line with a slope of 3/5. 78) State whether triangle A and triangle B are congruent, similar, or neither. a. Triangle A: (1,5) (1,9) (3,9) Triangle B: (-3,0) (-3,3) (-1,3) b. Triangle A: (2,5) (2,7) (5,7) Triangle B: (-2,2) (4,2) (4,6) c. Triangle A: (3,4) (1,4) (8,12) Triangle B: (1,-5) (-2,-6) (2,5) 79) Consider a slide. The top of the slide is 7 ft from the ground. The base of the slide is 10 ft from the ladder. What is the slope of the slide? If you were at the base of the slide, and moved 2 feet closer to the slide, how high is the slide at this point? How high off the ground would the slide be if you moved the slide base 2 ft towards where the ladder was? How far from the ladder would the base of the slide need to be placed if you wanted the slide to have a slope of 1/2? Find the slope of the hypotenuse from the triangle with the following points. 80) (7,1); (4,0); (7,0) 81) (0,2); (0,6); (-5,2) 82) (-2,3); (-2,4); (-4,4) 83) (-2,-2); (-2,2); (-1,2) 84) Find three points that form a triangle that lies on a line with a slope of 2/5. 85) State whether triangle A and triangle B are congruent, similar, or neither. a. Triangle A: (6,10) (6,14) (8,14) Triangle B: (-1,2) (-1,5) (1,5) b. Triangle A: (6,9) (6,11) (9,11) Triangle B: (-6,-9) (-6,-11) (-9,-11) NJ Center for Teaching and Learning ~ 9 ~

10 c. Triangle A: (3,6) (1,4) (1,12) Triangle B: (1,-5) (1,-6) (5,5) 86) Consider a slide. The top of the slide is 4 ft from the ground. The base of the slide is 2.5 ft from the ladder. What is the slope of the slide? How high off the ground would the slide be if you moved the slide base.5 ft towards where the ladder was? How far from the ladder would the base of the slide need to be placed if you wanted the slide to have a slope of 1/2? Parallel and Perpendicular Lines 87) What is a line parallel to y = -4/5x + 7? 88) What is a line parallel to y = -4x -4? 89) What is a line parallel to y = x? 90) What is a line parallel to y = 0? 91) What is a line perpendicular to y = 1/2x + 5? 92) What is a line perpendicular to y = -3/4x +4? 93) What is a line perpendicular to y = x? 94) What is a line perpendicular to y = -5x + 2? 95) What is a line parallel to y = 3/8x + 4? 96) What is a line parallel to y = -2x -7? 97) What is a line parallel to y = 3x? 98) What is a line parallel to y = 2? 99) What is a line perpendicular to y = -1/2x + 1? 100) What is a line perpendicular to y = 3/7x -4? 101) What is a line perpendicular to y = 9x? 102) What is a line perpendicular to y = -11/2x - 16? NJ Center for Teaching and Learning ~ 10 ~

11 Systems: Solve by graphing 103) y = -x 7 y = 4 x ) y = x + 2 y = x ) y = -3x 5 y = x ) y = -2x + 5 y = 1 3 x 2 107) y = -4x + 7 y = -3x ) y = 3 4 x 3 y = 3 4 x ) y = 4 3 x + 3 y = x 3 110) y = 1 3 x + 2 y = -x 2 111) y = 4x 1 y = -x ) y = 3x 4 y = 4x + 10 NJ Center for Teaching and Learning ~ 11 ~

12 113) y = x 4 y = ) y = -2x 2 y = -3x 6 115) y = x 2 y = x ) y = 3 4 x + 1 y = x 4 117) y = x 4 y = -x ) y = -4x 1 y = x ) y = -3x 3 y = 1 2 x ) y = x + 3 y = 2 5 x 1 121) y = -x 2 y = x ) y = x + 5 y = -x + 3 NJ Center for Teaching and Learning ~ 12 ~

13 Systems: Solve by Substitution 123) x = 4y 9 x = y ) 5x = -2y + 48 x = -3y ) y 4x = 28 y = -2x 2 126) y + 2x = -12 y = x ) x = -2y 7 2x + y = ) x = 5y 38 x = -4y ) y = 2x + 3 4x 2y = 8 130) x = -4y + 8 x = 3y ) 5y + 5x = 85 y = 4x ) x = y 12 x = 5y 40 NJ Center for Teaching and Learning ~ 13 ~

14 133) y = -5x x = -14 2y 134) y = 3x + 6-6x + 2y = ) y 3x = 0 y = -3x ) x = -3y x 4y = ) x = -4y x + 2y = ) y = -2x y 2x = ) 5y 5x = -15 y = -3x ) -4x = 3y + 32 x = -5y 8 141) y = -3x 1-4y + x = ) y = -4x y x = -7 NJ Center for Teaching and Learning ~ 14 ~

15 Systems: Solve by Elimination (Addition & Subtraction) 143) 3x + y = 36 5x + y = ) x + 2y = 25 x + 3y = ) 3x 5y = -52 x 5y = ) 2x + 3y = 4-2x + 5y = ) 2x + 2y = 2 5x 2y = ) -x + 2y = 14 x 2y = ) 4x y = 16 4x + 2y = ) 2x + 5y = 5-2x + y = ) 2x 2y = -12 x 2y = ) 5x + 5y = 40-5x + 3y = -40 NJ Center for Teaching and Learning ~ 15 ~

16 153) 4x y = -2 4x + 5y = ) 2x + 4y = 10-4x + 4y = ) -3x 5y = 49 3x + 4y = ) -4x + 3y = 39 5x 3y = ) -5x 2y = -5 -x 2y = ) x + 5y = -4 -x + 2y = ) -4x + 2y = -44 4x + 4y = ) x + 2y = 4 x + 5y = ) 3x y = -5-3x 2y = ) 3x y = 11-3x 5y = -71 NJ Center for Teaching and Learning ~ 16 ~

17 Systems: Solve by Elimination (Multiply First) 163) 5x 4y = 47 -x 16y = ) 3x 2y = 33-4x 4y = ) 2x + y = 21 4x + 3y = ) -3x + 3y = x + 5y = ) 3x + 4y = 3-12x y = ) 2x + 5y = -7 8x + 3y = ) 4x + 3y = 33 8x + y = ) 3x 2y = 11 4x 8y = ) x y = -8-4x + 2y = ) 2x + y = 0-8x + 4y = 80 NJ Center for Teaching and Learning ~ 17 ~

18 173) x + y = -5-3x + 4y = ) -2x y = 2-6x + 3y = ) -2x + 2y = 16 6x y = ) -4x 5y = -9 3x + 10y = ) 3x 2y = -26 6x 4y = ) x + 5y = -12 3x + y = 6 179) x + y = 14 4x 2y = 2 180) -3x + 3y = -3-12x + 5y = ) 3x + 2y = 27-9x + 4y = ) 4x + 4y = 20 2x 16y = -44 NJ Center for Teaching and Learning ~ 18 ~

19 Systems: Choose Your Own Strategy 183) x + 4y = 5 x + 4y = ) 3x y = 7 4x 2y = 8 185) 2y + 5x = 35 y = 4x ) 5x 4y = -39-3x 4y = ) y = -5x x + y = ) y = x + 6 y = 4 5 x ) -2x + 4y = 28 2x 3y = ) y = -x y + 3x = ) 2x + 4y = -10-4x 12y = ) x 5y = -3-2x + 5y = 9 NJ Center for Teaching and Learning ~ 19 ~

20 Systems: Choose Your Own Strategy 193) -3x + 5y = x 4y = ) y = 3x 18 y 3x = ) x + 3y = 16 -x + 4y = 5 196) x = -3y 19 x + 5y = ) 3x 3y = 12 9x + 2y = ) y = x + 4 y = 2 3 x ) 3x + 2y = 21-3x + 5y = ) x y = 7 -x + 5y = ) 4x + y = -28-2x + 2y = ) x = 2y 7 -x + 4y = 17 NJ Center for Teaching and Learning ~ 20 ~

21 Writing Systems to Model Situations 203) The admission fee at a carnival is \$3.00 for children and \$5.00 for adults. On the first day 1,500 people enter the fair and \$5740 is collected. How many children and how many adults attended the carnival? 204) A builder placed two orders with the hardware store. The first order was for 25 sheets of plywood and 4 boxes of nails and the bill totaled \$357. The second order was for 35 sheets of plywood and 2 boxes of nails and the bill totaled \$471. The bills do not list the per-item price. What were the prices of one piece of plywood and one box of nails? 205) Two friends bought some markers and pens. The first bought 4 markers and 5 pens and it cost him \$6.71. The second friend bought 5 markers and 3 pens, which cost her \$7.12. What is the price for one marker and one pen? 206) The ticket price for the movies is \$7.50 for children and \$10.50 for adults. One night 825 people bought tickets and \$ was collected from ticket sales. How many children and how many adults bought tickets. NJ Center for Teaching and Learning ~ 21 ~

22 Answer Key Tables 1-5 Answers will vary 6-10 Answers will vary Slope and y-intercept 11) Lines y intercept Slope (+, -, 0 or undefined A 0 - B 6 + C -5 + D ) 15) Lines y intercept Slope (+, -, 0 or undefined I 8 0 J 3 - K -1 + L -8 + Lines Equation M -1 N 2 O 0 P -1/3 12) Lines slope 16) Lines Equation E ½ F -2 G Undefined H 1 M y = -x+5 N y = 2x O y = -4 P y = -1/3x ) Lines Equation E y = 1/2x + 1 F y = -2x + 4 G x = 8 H y = x - 7 NJ Center for Teaching and Learning ~ 22 ~

23 Slope Formula 17) -1/4 18) ) undefined 20) -3/4 21) -1/2 22) 6 23) 5/4 24) 1/9 25) 3 26) 0 27) -5 28) -1 29) 3/2 30) 0 31) -3 32) -1 33) undefined 34) ) ½ 36) 6/7 Slope Intercept Form 37a) y = -2x+1 37b) y = -1/2x 37c) y = -x+1 37d) y = -2/5x 1 37e) y = -3/2x 3 38) line O 39) line M 40) line P 41) line N 42a) y = 3/2x 2 42b) y = x c) y = 2x 3 42d) y = 1/2x e) y = x 42f) y = 2x Rate of Change 47) 37.5 mph 48) mile marker ) y = 10x + 15, x being number of hours 50) y = x , x being number of weeks 51) \$31 52) mph 53) mile marker ) y = 7.50x + 50, x being number of hours 55) y = -400x + 15,000, x being number of weeks 56) \$34 Proportional Relationships and Graphing 57) y = 8x 58) y = 4.50x 59) y = 6/5x 60) y = 4x 61) y = 1/5x 62) y = 1/3x 63) y = 5x 64) y = 1/30x 65) y = 2x 66) y = 2x 67) y = 4/3x 68) y = 8/3x 69) y = 1/3x 70) y = 1/7x 71) y = 20x 72) y = 2/5x Slopes & Similar Triangles 73) -4/7 74) 4/5 75) -1/2 76) 4 77) answers will vary 78a) neither 78b) similar 78c) neither NJ Center for Teaching and Learning ~ 23 ~

24 43) line L 44) line I 45) line K 46) line J 80) 1/3 81) 4/5 82) -1/2 83) 4 84) answers will vary 79) The slope of the slide is 7/10. The slide would be 1.4 ft high. The base of the slide would need to be 14 feet away if you wanted a slope of ½. 104) (4,1) 85a) neither 85b) congruent 85c) neither 86) Slope of the slide is 8/5. The slide would be.8 ft high. The base of the slide would need to be 8 feet away. Parallel and Perpendicular Lines Answers will vary Answers will vary 105) (-2,1) Systems: Solve by Graphing 103) (0,-7) NJ Center for Teaching and Learning ~ 24 ~

25 106) (3,-1) 109) (-3, -1) 107) (4, -9) 110) (-3, 1) 108) no solution NJ Center for Teaching and Learning ~ 25 ~

26 111) (1, 3) 114) (-4,6) 112) (-14, -46) 113) (-5, 3.5) 115) no solution NJ Center for Teaching and Learning ~ 26 ~

27 116) (-4, -2) 118) (2, -9) 117) (3, -1) 119) (-2, 3) NJ Center for Teaching and Learning ~ 27 ~

28 120) (5, 1) 122) (-1, 4) 121) ( -8, 6) Systems: Solve by Substitution 123) (7, 4) 124) (8,4) 125) (-5, 8) 126) (-9, 6) 127) (-7, 0) 128) (-8, 6) 129) no solution 130) (8, 0) 131) (7, 10) 132) (-5, 7) 133) (8,1) 134) solutions 135) (-3, -9) 136) (7, 2) 137) (5, 6) 138) (2, 7) 139) (8, 5) 140) (-8, 0) 141) (-1, 2) 142) (4, 1) NJ Center for Teaching and Learning ~ 28 ~

29 Systems: Solve by Elimination (Add & Subtract) 143) (10, 6) 144) (9, 8) 145) (-9, 5) 146) (-10, 8) 147) (6, -5) 148) no solution 149) (4, 0) 150) (10, -3) 151) (1, 7) 152) (8, 0) 153) (0, 2) 154) (-7, 6) 155) (-8, -5) 156) (-6, 5) 157) (1, 0) 158) (6, -2) 159) (9, -4) 160) (8, -2) 161) (0, 5) 162) (7, 10) Systems: Solve by Elimination (Multiply First) 163) (3, -8) 164) (5, -9) 165) (6, 9) 166) (9, 0) 167) (5, -3) 168) (9, -5) 169) (3, 7) 170) (1,4) 171) (-1, 9) 172) (-5, 10) 173) (8,3) 174) (1, -4) 175) (-1, 7) 176) (1, 1) 177) no solution 178) (3, -3) 179) (5, 9) 180) (8, 7) 181) (7, 3) 182) (2, 3) Systems: Choose Your Own Strategy 183) (3, 2) 184) (3, 2) 185) (7, 0) 186) (-3, 6) 187) (10, 9) 188) (0, 6) 189) (6, 10) 190) solutions 191) (3, -4) 192) (-2, 1) 193) (3, -6) 194) no solution 195) (7, 3) 196) (-29/2, -3/2) 197) (10, 6) 198) (-3, 8) 199) (3, 6) 200) (-9, 2) 201) (-8, 4) 202) (3, 5) Writing Systems to Model Situations 203) 620 adults, 880 children 204) \$13 for plywood, \$8 for box of nails 205) marker costs \$1.19, pen costs \$ ) 219 children, 606 adults NJ Center for Teaching and Learning ~ 29 ~

30 Graphing Linear Equations Unit Review PMI - Eighth Grade Name: Date: Multiple choice questions: choose the correct answer. 1. What is the y-intercept of a line? a. The point at which the line crosses the origin. b. The point at which the line crosses the y-axis. c. The point at which the line crosses the x-axis. d. The point at which the line stops 2. All of the following statements about the slope of a line are true except: a. Slope is rise over run of a line. c. Slope can be negative. b. Slope is run over rise. d. Slope can be undefined. 3. For the slope intercept form, y = mx+b, the m is: a. Slope b. y-intercept c. x-intercept d. line 4. For the slope intercept form, y = mx+b, the b is: a. Slope b. y-intercept c. x-intercept d. line 5. The slope is for the line x = -5. a. Positive b. Negative c. Zero d. Undefined 6. The slope is for the line y=x. a. Positive b. Negative c. Zero d. Undefined 7. The slope is for the line y =-x. a. Positive b. Negative c. Zero d. Undefined 8. Given a line with the equation y = -2/3x+5, what would be the slope of the line that is perpendicular to this line? a. -2/3 c. -3 b. 2 d. 3/2 NJ Center for Teaching and Learning ~ 30 ~

31 9. Given a line with the equation y =-9x+12, what would be the slope of the line that is perpendicular to this line? a. -9 c. -1/9 b. 1/9 d The line that passes through the points (2, 2) and (2, -2) has a slope that is: a. Positive c. Zero b. Negative d. Undefined 11. The line that passes through the points (-10, 2) and (12, 6) has a slope that is: a. Positive c. Zero b. Negative d. Undefined 12. What is the slope of the line that passes through the points (8,-2) and (12, -2)? a. -5 c. Zero b. ½ d. Undefined 13. What is the slope of the line that passes through the points (-3,0) and (5, 12)? a. 3 c. -3/2 b. ½ d. 3/2 14. What is the slope of the line that passes through the points (-7,1) and (7,8)? a. ½ c. -1/2 b. 2 d The following points lie on the line y =2x + 7, except: a. (1, 9) b. (-2, 3) c. (4, 12) d. (-4, 1) 16. The following points lie on the line y = -2/3x-4, except: a. (0, -4) b. (-3, -2) c. (-6, 9) d. (-12, 4) 17. If Sarah can make \$30 a week babysitting, and she deposits her money into a savings account that originally had \$100 dollars, how much will she have after 5 weeks? a. \$150 c. \$200 b. \$100 d. \$ If you were to write an equation for the amount of money Sarah has from question 16, what would be the y-intercept? a. \$150 c. \$200 b. \$100 d. \$250 NJ Center for Teaching and Learning ~ 31 ~

32 19. A car traveling a constant speed of 55 miles an hour passed mile marker 126 on the interstate. After 3 hours of traveling, what mile marker will it have passed? a. Mile marker 391 c. Mile Marker 291 b. Mile marker 290 d. Mile Marker Monique earned \$15,000 for her contract job. She spends \$250 a week on living expenses. After 6 weeks, how much will she have left? a. \$13,000 c. \$12,000 b. \$13,500 d. \$11, What is true about the lines y = -x-7 and y = 4/3x-7? a. They have the same y-intercept. b. They are parallel. c. They are perpendicular. d. They have the same slope. 22. What is true about the lines y = x+2 and y = -x-2? a. They have the same y-intercept. b. They are parallel. c. They are perpendicular. d. They have the same slope. 23. John raised his candy price to \$6 per lb. He also raised shipping prices to \$10 per order. Kathy ordered 6 lbs. of candy on Monday, but then she realized she needed more. She placed a separate order of 2 lbs. on Tuesday. How much did she spend on both orders? a. \$58.00 c. \$70.00 b. \$68.00 d. \$ Payal made \$400 from her last job. Each week, she spends \$20 on food. Which equation would represent how much money she has left after x number of weeks? a. y =20x+400 c. y =-20x+400 b. y = 20x-400 d. y =-20x Suppose Payal had \$600 just prior to her last job. Using the information from question 23, which equation will represent how much money she has after x number of weeks? a. y =20x+1000 c. y =-20x+1000 b. y = 20x-600 d. y =-20x-600 NJ Center for Teaching and Learning ~ 32 ~

33 Short Constructed Response Questions: Solve each problem, and write the answer on the line. For questions refer to the following graph. State if the slope is +, -, 0, or undefined for the following: 26. Line A: 27. Line B: 28. Line C: 29. Line D: 30. Line E: Write the equation for the following lines: 31. Line A: 32. Line B: 33. Line C: 34. Line D: 35. Line E: Solve the following systems of equations: 36. x = 4y-0, x = y+3 Answer: 37. y =2x+3, 4x-27 = 8 Answer: 38. y = 10x+20, -30x + 3y = 60 Answer: 39. x-y=-8, -4x+2y = 22 Answer: 40. y = 3x-18, y-3x+ -24 Answer: NJ Center for Teaching and Learning ~ 33 ~

34 Extended Constructed Response Questions: 41. Consider a slide shaped like a right triangle. The base of the slide is 20 feet away from the ladder. The top of the slide is 8 feet high. Hint: Draw a picture a. What is the slope of the slide? b. Write an equation for the line that the slide would form. c. Let s say you were standing at the bottom of the slide, and walked 5 feet closer to the ladder. How high is the slide at this point? d. If the slide was 22 feet long, what would be the new slope? 42. Bob sells pineapples in a pineapple stand in Lahaina, Hawaii. Today, he has 100 pineapples to sell. Based on his experience, he usually sells about 10 pineapples per hour. a. Write an equation that represents how many pineapples he can sell in one day. b. Using your equation from part a, draw a graph. c. If he starts selling at 10 a.m., how many pineapples has he sold so far at 2 p.m.? d. What time will he have sold all of his pineapples? 43. Fred placed an order with the furniture store. He ordered metal chairs at \$25 each and plastic chairs at \$10 each. His order totaled \$ There were 30 chairs he ordered. How many of each chair did he order? a. Write a system of equations that describes this situation, and define your variables. b. How many of each chair did he order? 44. A group of 148 people is spending five days at a summer camp. The cook ordered 12 pounds of food for each adult and 9 pounds of food for each child. A total of 1,410 pounds of food was ordered. a. Write a system of equations that describes this situation, and define your variables. b. Solving the system of equations from part a, find the number of adults and number of children that were at the camp. NJ Center for Teaching and Learning ~ 34 ~

35 Graphing Linear Equations Unit Review Answer Key 1. B 2. B 3. A 4. B 5. D 6. A 7. B 8. D 9. B 10. D 11. A 12. C 13. D 14. A 15. D 16. C 17. D 18. B 19. C 20. B 21. A 22. C 23. B 24. C 25. C 26. Undefined Negative 29. Positive 30. Negative 31. x = y = y = -5/2x 34. y = x 35. y = - 1/4x (4,1) 37. No solution 38. infinitely many solutions 39. (-1,9) 40. No solution 41. A. depending on the way the student drew the slide, the slope should be 2/5 or -2/5 B. y=2/5x+8 C. 2 ft off the ground. D. 4/ A. y = -10x C. 40 pineapples D. 8 p.m. 43. A. m = number of metal chairs, p = number of platic chairs, m + p= 30, 25m + 10p = 400 B. Fred ordered 10 metal chairs and 20 plastic chairs. 44. A. a = number of adults, c = number of children, a + c =148, 12a + 9c=1,410. B. 26 adults, 122 children NJ Center for Teaching and Learning ~ 35 ~

36 NJ Center for Teaching and Learning

### Solving and Graphing Linear Inequalities Chapter Questions. 2. Explain the steps to graphing an inequality on a number line.

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