Chapter 4 Review

1. Evaluate the function at f(-3) f(x)= -3x + 5

2. Evaluate the function at m(2) m(x)= -8x – 2

3. Find the value of x so that the function has the given value. f(x)= 4x + 11; -13

4. Find the value of x so that the function has the given value. f(x)= 9x – 5; -2

5. Find the x and y intercepts 4x – 3y = 12

6. Find the x and y intercepts -2x + 7y = -12

7. Find the slope (-4, 3) and (7, 5)

8. Find the slope (1,2) and (-2, 2)

9. Find the slope (4, -1) and (4, 3)

10. Find the slope (3, 2) and (4, 3)

11. Decide whether the given ordered pair is a solution of the equation. 5x + 3y = 2; (2, -4/5)

12. Decide whether the given ordered pair is a solution of the equation. 2x + y = 10; (-4, 18)

13. Graph this equation using intercept method. 5x + 10y = 30

14. Graph this equation using intercept method. 2y – 12x = -6

15. Graph this equation using slope-intercept form. y = 5x - 4

16. Graph this equation using slope-intercept form. 6x – 2y = 2

17. Graph the function. 6x = 12

18. Graph the function. y – 3 = -5

19. Application My van needs new brakes. Brakes Plus charges $150 for parts and $75 per hour. Midas charges $120 for parts and $90 per hour. Graph the two equations. Brakes Plus Midas C=150 + 75t C=120 + 90t If the repair takes 4 hours, which one is cheaper and by how much.

Answers

1. 14

2. -18

3. -6

4. 1/3

5. x-intercept = 3; (3,0) y-intercept = -4 (0,-4)

6. x-intercept = 6; (6,0) y-intercept = -12/7 (0,-12/7)

7. 2/11

8. 0

9. undefined

10. 1

11. No

12. Yes

13.

14.

15.

16. y = 3x - 1

17. x = 2

18. y = -2

19. After 4 hours, Brakes Plus is cheaper by $30.