Question

What is the rate of change between (9,-29) and (13,-28)?

Answer 1

`(1)/(4)`

Explanation:

rate of change is a measure of the slope.

Calculate slope m using the slope formula

m =
`(y_(2)-y_(1) )/(x_(2)-x_(1) )`

with (x₁, y₁ ) = (9, - 29) and (x₂, y₂ ) = (13, - 28)

m =
`(-28-(-29))/(13-9)` =
`(-28+29)/(4)` =
`(1)/(4)` ← rate of change

Answer 2

-20

Explanation: