9. (3, 8), (7,2)
Find rate of change

 - 3/2

Step-by-step explanation:

The rate of change is the same as the slope.

To find the slope, find the change in the y coordinates of both point and divide it by the change in the x coordinates.

y coordinates:  2 and 8

x coordinates:  7 and 3

2 - 8 = -6

7 - 3 = 4  

Slope :  -6/4 =  - 3/2

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb