6-1 Slope. Objectives 1. find the slope of a line 2. use rate of change to solve problems

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1 6-1 Slope Objectives 1. find the slope of a line 2. use rate of change to solve problems

2 What is the meaning of this sign? 1. Icy Road Ahead 2. Steep Road Ahead 3. Curvy Road Ahead 4. Trucks Entering Highway Ahead

3 What does the 7% mean? 7% is the slope of the road. It means the road drops 7 feet vertically for every 100 feet horizontally. 7% 7 feet 100 feet So, what is slope??? Slope is the steepness of a line.

4 Slope can be expressed different ways: m ( y y ) rise vertical change 2 1 ( x x ) run horizontal change 2 1 A line has a positive slope if it is going uphill from left to right. A line has a negative slope if it is going downhill from left to right.

5 1) Determine the slope of the line. When given the graph, it is easier to apply rise over run.

6 Determine the slope of the line. Start with the lower point and count how much you rise and run to get to the other point! 6 rise run 3 = = Notice the slope is positive AND the line increases!

7 2) Find the slope of the line that passes through the points (-2, -2) and (4, 1). When given points, it is easier to use the formula! m ( y y ) 2 1 ( x x ) 2 1 y 2 is the y coordinate of the 2 nd ordered pair (y 2 = 1) y 1 is the y coordinate of the 1 st ordered pair (y 1 = -2) m (1 ( 2)) (4 ( 2)) (1 2) (4 2)

8 Did you notice that Example #1 and Example #2 were the same problem written differently? 3 6 (-2, -2) and (4, 1) 1 slope 2 You can do the problems either way! Which one do you think is easiest?

9 Find the slope of the line that passes through (3, 5) and (-1, 4) ¼ 4. - ¼

10 3) Find the slope of the line that goes through the points (-5, 3) and (2, 1). 1 3 m y 2 y 1 x 2 x 1 m 2 5 m 2 1 ( 3 5) m 7 2

11 Determine the slope of the line shown ½ 3. ½ 4. 2

12 Determine the slope of the line Find points on the graph. Use two of them and apply rise over run. rise run The line is decreasing (slope is negative).

13 What is the slope of a horizontal line? The line doesn t rise! m 0 number 0 All horizontal lines have a slope of 0.

14 What is the slope of a vertical line? The line doesn t run! m number 0 undefined All vertical lines have an undefined slope.

15 Remember the word VUXHOY Vertical lines Undefined slope X = number; This is the equation of the line. Horizontal lines O - zero is the slope Y = number; This is the equation of the line.

16 Draw a line through the point (2,0) that has a slope of Graph the ordered pair (2, 0). 2. From (2, 0), apply rise over run (write 3 as a fraction). 3. Plot a point at this location. 4. Draw a straight line through the points.

17 The slope of a line that goes through the points (r, 6) and (4, 2) is 4. Find r. To solve this, plug the given information into the formula m ( y 2 y 1 ) (x 2 x 1 ) r

18 To solve for r, simplify and write as a proportion r r Cross multiply r 4(4 r) = 1(-4)

19 Simplify and solve the equation. 4(4 r) = 1(-4) 16 4r = r = r = 5 The ordered pairs are (5, 6) and (4, 2)

20 Slope can be used to describe a rate of change. Rate of change tells, on average, how a quantity is changing over time. rise run change in quantity change in time

21 Travel The graph to the right shows the number of U.S. passports issued in 1991, 1995, and Find the rates of change for and Use the formula for slope. millions of passports years

22 : Substitute. Simplify. Answer: The number of passports issued increased by 1.9 million in a 4-year period for a rate of change of 475,000 per year.

23 : Substitute. Simplify. Answer: Over this 4-year period, the number of U.S. passports issued increased by 1.4 million for a rate of change of 350,000 per year.

24 Explain the meaning of slope in each case. Answer: For , on average, 475,000 more passports were issued each year than the last. For , on average, 350,000 more passports were issued each year than the last.

25 How are the different rates of change shown on the graph? Answer: There is a greater rate of change from than from Therefore, the section of the graph for has a steeper slope.

26 Airlines The graph shows the number of airplane departures in the United States in recent years. a. Find the rates of change for and Answer: 240,000 per year; 180,000 per year

27 b. Explain the meaning of the slope in each case. Answer: For , the number of airplane departures increased by about 240,000 flights each year. For , the number of airplane departures increased by about 180,000 flights each year.

28 c. How are the different rates of change shown on the graph? Answer: There is a greater vertical change for than for Therefore, the section of the graph for has a steeper slope.

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