SOLUTION: Roger buys and plants a tree sapling measured at 3 feet tall. After 1 year of growth, the tree is 4.5 feet tall. After 3 years of growth the tree is 7.5 feet tall. If the growth

Question 867688: Roger buys and plants a tree sapling measured at 3 feet tall. After 1 year of growth, the tree is 4.5 feet tall. After 3 years of growth the tree is 7.5 feet tall. If the growth of the tree were place on a graph, what would be the slope value?
I am given options
A. initial planting height of 3 feet.
B. 4.5 feet after 1 year of growth.
C. Beginnings height of 0 feet.
D. 1.5 feet per year of growth. I think it is D, but I am not sure. I think it would look like y= mx+b, where b would represent Y. I would appreciate some guidance. doing word problems is a major weakness for me. Thank you for your help
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
You have several points.
0,3 which tells us the y intercept
b is y when x=0
y=mx+3
3, 7.5
1,4.5
(7.5-4.5)/(3-1)
3/2=1.5
So D is correct

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