SOLUTION: Four years after a hedge maple tree was planted, its height was 9 feet. Eight years after it was planted, the hedge tree height was 12 feet. What is the growth rate of the hedge ma

Algebra ->  Graphs -> SOLUTION: Four years after a hedge maple tree was planted, its height was 9 feet. Eight years after it was planted, the hedge tree height was 12 feet. What is the growth rate of the hedge ma      Log On


   

Question 1003913: Four years after a hedge maple tree was planted, its height was 9 feet. Eight years after it was planted, the hedge tree height was 12 feet. What is the growth rate of the hedge maple? what was its height when it was planted?
Please show work.

Thanks for your help
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Points (t,h) for years, height.
Points are (4,9) and (8,12).
Try staying in slope-intercept form, h=mt%2Bb.
m=%2812-9%29%2F%288-4%29 and b=h-mt.

Substitute either point, and once simplified in slope-intercept form for the described example, you have your vertical axis intercept, b.