Question

What is the rate of change for the table below?

x
10
20
30
40
у
60
90
120
150

Answer 1

The rate of change is: as x increases by 10, y increases by 30. In other words, the rate of change is +30

Explanation:

When calculating rate of change you see how much the y increases/decreases each time the x increases/decreases as we see, each time the x goes up by 10 the y goes up by 30.

Answer 2

Unproportional. 60/10=6
90/20=4.5
120/30=4
150/40=3.75