Graphing Linear Equations: Warm Up: Brainstorm what you know about Graphing Lines: (Try to fill the whole page) Graphing

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2 Graphing Linear Equations: Warm Up: Brainstorm what you know about Graphing Lines: (Try to fill the whole page) Graphing

3 Notes: The three types of ways to graph a line and when to use each: Slope intercept form: Intercept Method: XY chrt (table of values): Graph the following lines: x + y = 3 2x + 3y = 12

4 x 3 y 1 x = -3 Y = 4 y = x y x 3 Points to Remember: Homework:

5 Writing the Equation of a Line: Warm-up: Solve each equation for Y, then find the slope of the line. A. 3x + 4y = 7 B. -2x 6y = 2 Graph each equation A. y = ½ x + 3 B. 2x 3y = 12 Write the equation of the line given: A. Slope of 3 and a y intercept of -2 B. m = -5 and b = 7 Notes: What do I need to write the equation of a line:

6 Forms to write the equation of a line: Slope intercept: Point Slope: Standard Form: Find an equation in standard form for each line: 1. through (-3, 5) (-6,4) Using Slope intercept form: Using point slope form: Find the equation in standard form : 1. Through the point (4,-3) and has a slope of Using slope intercept form: 2 5 Using point slope form:

7 2. Having a slope of -2 and a y intercept of 3 4. Using slope intercept form: Using point slope form: 3. Passing through the points: Using slope intercept form: 3, 4 5 4, 1 1, 4 2 Using point slope form: Points to Remember: Homework: Page eoo.

8 Mathematician: Extra Credit Use the following information to help with some of the problems. Standard form of an equation is AX + BY = C. The slope of the line is then. Find the value of K so that it has the given slope m. 1. kx 3 y = 7, m = x + ky = 10, m = 2 3. (k+3)x 3y = 1 m = k 4. (k+1)x + 2y = 6, m = k-2 Find the value of K so that the line through the given point has the slope m. **Hint** think about what formula you need. 5. (2k,3) (1,k) m = 2 6. (k+1, 3+2k) (k-1, 1-k) m = k

9 Functions and Slope Warm Up: Find the slope of the line: (4,1) (8,7) Write the general form of the following: Point Slope Form: Slope Intercept Form: Write the equation of the line in slope intercept form given the following information: m = 2 b = 3 Point (0,1) Slope = -1 Point ( 1, 5) Slope = 2 Point (6, -2) Slope 3 2 What does the acronym AKA mean?

10 Notes: Notation: Slope intercept form is. Another way to write it is in function form. Therefore y is the same as. The part in the parenthesis is the. Also it is equal to. f(-4) = 8 can be written as because f( ¾ ) = -5 can be written as - Find an equation of the linear function f using the given information. 1. m = 2, b = 3 2. m = -1 b = ½ 3. m=2 and f(1) = 5 4. m = 3, f(0) = 1

11 5. f (3) = 4, f(6) = f(-1) = 2, f(2) = 2 Points to Remember: Homework: page 149 written exercises 1-21 odd

12 Functions and Relations Warm Up: Find the slope of the line and write the equation of the line: A. f(-2) = 5, f(-2) = 12 B. f(3) = 8, f(4) = 8 C. f(0) = 2, f(6) =18 Write the definition of domain: Write the definition of range: Give the range of the equation 4-2x for the domain { -1, 0, 1, 2, 3} If f(x) = 2x + 5 find f(3)

13 NOTES: Definition of Relation: Function: How a relation can be a function: State the domain and range of the relation. Is the relation a function? {(-1, 2), (0,1), (1,2)} {(2,1), (1,-1), (0.2) (2,0)} Domain: Range: Function yes or no and why: Domain: Range: Function yes or no and why: Domain: Range: Function yes or no and why: Domain: Range: Function yes or no and why:

14 More new notation: Old Notation: Semi New Notation Very New Notation Y = 2x f(x) = 2s f : x 2x y = -3x + 5 g(x) = -3x +5 g : x 3x 5 Analysis: Find the range for each function: What does that mean? What do we do? 2 f : x 1 x D = { -1, 0,1 } 2 3 H : z z z D = {-1,0,1,2} How do I do this on the calculator: Points to Remember: Homework: Page odd by hand show all work odd on the graphing calculator. Page 155 oral exercises 1-9 odd page 156 written exercises 1-5 odd. Just tell if relation is a function why or why not.

15 Functions and Relations Continued Warm Up: Write the equation of the line give the following conditions: A. f(0) = -1; f(x) decreases by 3 when x increases by 1. B. f(3) = 7 and f(-5) = 7 C. f(3) = 4 and f(6) = -3 Explain how you know a relation is a function: Is the relation a function, why or why not? A. {(1,2),(2,2),(3,1),(4,1)} B.

16 NOTES: Definition of Domain: What is the domain of a square root function: We know that you can not take the square root of a ; so the doma2in has to be. Therefore anything inside the AKA must be zero. We also know that we can NOT by zero. Which means the of a fraction can not equal. Therefore the domain of a fraction is real numbers where the denominator would be to. Give the domain of each function 2 g ( x ) f ( x ) 2x 1 x 3 g ( x ) ( x 2 1)( x 2) Points to Remember: Homework:

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