Question

You planted a redwood tree in your backyard, and the height of the tree changed at a constant rate as the tree grew. The tree was 13 meters high 2 years after you planted it. The tree was 22 meters high 5 years after you planted it. How many meters tall was the redwood tree when you planted it?

Answer 1

Use this info:
13 meters at 2 years
22 meters at 5 years
How many years is it from 2 years to 5 years?

Answer 2

How many meters is it from 13 meters to 22 meters?
With the answers to these questions, find how many meters the tree grows per year.
Then subtract twice that amount from 13 meters to know the height at year 0.