Question

A tree’s height, in feet, is proportional to the number of years it has been growing. The graph shows this relationship.

What is the unit rate for feet per year?

Answer 1

7/10 feet/year

Explanation:

This straight line graph passes thru (0, 0) and (10, 7).

As x increases from 0 to 10, y increases from 0 to 7. Thus, the slope of this line, which is the unit rate, is m = rise / run = 7/10 feet/year.