SOLUTION: Y varies directly as the square of R If Y=162 and R=9 then find answer for Y, when R=7

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Question 428609: Y varies directly as the square of R
If Y=162 and R=9
then find answer for Y, when R=7
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
We can write
Y+=+kR%5E2, where k is a constant
Y = 162, R = 9
Solve for k:
162 = k*81 -> k = 2
Therefore, when R = 7:
Y = 2*7^2 = 98
Ans: Y = 98