anonymous one year ago What is the average rate of change from x = -4 to x = 1? -3 -1 0 1

1. anonymous

2. freckles

can you find the function value at x=-4?

3. freckles

we will also need to find the function value at x=1

4. freckles

|dw:1433531910745:dw| your graph looks kind of like this

5. freckles

|dw:1433532004730:dw| so you can you tell me the y values for both x=1 and x=-4?

6. anonymous

3 and -1?

7. freckles

yep

8. freckles

enter in and evaluate $\frac{y_2-y_1}{x_2-x_1}$

9. freckles

you are just finding the slope of the line going through (1,-1) and (-4,3)

10. freckles

|dw:1433532217203:dw|

11. anonymous

12. freckles

$\frac{3-(-1)}{-4-1}$ hmm... what do you get when you do the numerator 3+1=? and the denomintor -(4+1)=?

13. anonymous

$\frac{ 4 }{ 5}$

14. anonymous

negative 5 sorry

15. freckles

don't forget the negative -(4+1)=-(5)=-5

16. freckles

yeah

17. freckles

you are done -4/5 is the average rate of change from x=-4 to x=1

18. anonymous

but thats not one of the answer choices

19. freckles

you can always divide 4 by 5 too

20. anonymous

i got 0.8

21. freckles

and attach the negative you had