SOLUTION: A plant grows 3.5 cm per week.It is now 10 cm tall.How many weeks from now will the plant grow to a height of 27.5 cm?

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Question 996161: A plant grows 3.5 cm per week.It is now 10 cm tall.How many weeks from now will the plant grow to a height of 27.5 cm?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
y=mx%2Bb

m=3.5%28cm%2Fweek%29
Now, b=10%2Acm
y=3.5x%2B10

Want x for y=27.5.

mx=y-b
x=%28y-b%29%2Fm
x=%2827.5-10%29%2F3.5