1. 1)Find slope of (4, 3) and (-4, 6) 2)Round to the nearest tenths, 213.924 3)Find the area and perimeter of the given rectangle, include units. 4)Solve for 3x – 5 = 35. 5)Solve for t, d=rt. 8 cm 3 cm

2. Graphing Activity Students will receive an equation in slope- intercept form in groups of 2-3. They will need to find the x-intercepts and y-intercepts. Then they will graph the equation.

3. Slope-intercept form December 5/6, 2011

4. Vocabulary Reminders Slope – Rise y – y Slope is usually a Run x – x fraction y-intercept –where a line crosses the y-axis –when x = 0 –(0, y) Slope-intercept form – y = mx + b, m is the slope and b is the y-intercept

5. Example 1 Given slope of 5 and y-intercept of (0, -12) What is the slope-intercept equation? y = 5x – 12

6. Example 2 Given y = -x + 3 What is the slope? m=-1 What is the y-intercept? (0, 3)

7. Example 3 Given y = ⅝x What is the slope? m= ⅝ What is the y-intercept? (0, 0)

8. Now you try! Identify the slope and y-intercept of each equation. y = ¼x – 4 y = x + 10 Slope is -3 and y-intercept is (0, -9) y = ¾x + 8 Slope is ½ and y-intercept is (0,0)

9. Independent Practice Follow the directions for problems 1-8. You have 10 minutes.

10. Graphing from Slope-intercept form Given y = 3x + 1 Slope is 3 y-intercept is (0, 1) y x O

11. Graphing from Slope-intercept form Given y = 3x + 1 Slope is 3 y-intercept is (0, 1) 1 st plot the y- intercept y x O

12. Graphing from Slope-intercept form Given y = 3x + 1 Slope is 3 y-intercept is (0, 1) 1 st plot the y- intercept 2 nd use the slope as a fraction of 3/1 –3 is the rise (up) y x O

13. Graphing from Slope-intercept form Given y = 3x + 1 Slope is 3 y-intercept is (0, 1) 1 st plot the y- intercept 2 nd use the slope as a fraction of 3/1 –3 is the rise (up) –1 is the run (right) y x O

14. Graphing from Slope-intercept form Given y = 3x + 1 Slope is 3 y-intercept is (0, 1) 1 st plot the y- intercept 2 nd use the slope as a fraction of 3/1 –3 is the rise (up) –1 is the run (right) y x O (1, 4)

15. Now you try! Use the equation before and now graph y = ¼x – 4 y = x + 10 y = -3x – 9 y = ¾x + 8 y = ½x

16. Given a graph find the equation Find y-intercept (0, 4) Find new point on line (1, 1) Find the slope -3/1 = -3 Equationy = -3x + 4

17. Real world Jon is working at as a salesperson for the year. He is getting paid $200 per week and a $500 Christmas bonus. What is the slope and y-intercept? What is the slope- intercept equation? Slope is $200 y-intercept is $500 Equation is y = 200x +500

18. Independent Practice Follow the directions for 9-16. You have 15 minutes for these problems.