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Warm Up… Solve each equation for y. (1)y – 5 = 4x (2) y + 2x = 7 (3) 2y + 6 = -8x Calculate the slope given the two points. (4) (-4, 4) and (2, -5) (5)

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Presentation on theme: "Warm Up… Solve each equation for y. (1)y – 5 = 4x (2) y + 2x = 7 (3) 2y + 6 = -8x Calculate the slope given the two points. (4) (-4, 4) and (2, -5) (5)"— Presentation transcript:

1 Warm Up… Solve each equation for y. (1)y – 5 = 4x (2) y + 2x = 7 (3) 2y + 6 = -8x Calculate the slope given the two points. (4) (-4, 4) and (2, -5) (5) (0, -1) and (1, -6)

2 #6.2 - Graphing Linear Equations In Slope-Intercept Form Objective: SWBAT graph linear equations

3 A linear equation graph will always create a line. Linear equations are in the form y = mx + b or can be rewritten into the form y = mx + b. In this section, instead of making a table, evaluating y for each x, plotting the points and making a line, we will use The Slope-Intercept Form of the equation to graph the line.

4 These equations are all in Slope- Intercept Form: Notice that these equations are all solved for y.

5 Formula for Slope – Intercept Form ‘b’ is the y-intercept (the point where the graph crosses the y – axis) ‘m’ is the slope y = mx + b

6 Just by looking at an equation in this form, we can draw the line (no tables). The constant is the y-intercept. The coefficient is the slope. Constant = 1, y-intercept = 1. Coefficient = 2, slope = 2. Constant = -4, y-intercept = -4. Coefficient = -1, slope = -1. Constant = -2, y-intercept = -2. Coefficient = 3/2, slope = 3/2.

7 up 2 right 1 up 2 right 1

8 down 1 right 1 down 1

9 right 2 up 3 right 2 up 3

10 y = x

11 y = -3 x = 2

12 Sometimes we must solve the equation for y before we can graph it. The constant, b = 3 is the y-intercept. The coefficient, m = -2 is the slope.


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