Question

I need to write an equation that gets me to y=mx+b

Help..?


47.
Four years after a hedge maple tree was planted, its height was 9 feet.

Eight years after it was planted, the hedge maple tree's height was 12 feet.

What is the growth rate of the hedge maple?

What was its height when it was planted?

Answer 1

Answer: 3/4 and 6 feet

Explanation:

It grows 3 feet in four years.

9 feet + 3 feet = 12 feet

Let its height when it was planted is a.

a + 3 feet = 9 feet

Therefore, a = 6 feet

It grows 3 feet in four years.

So, it grows 3/4 feet in a year.

Therefore, the formula must be 3/4x+6=y