SOLUTION: For the following problem, y varies inversely as the square of x. If y = 81 when x = 9, find y when x is 3

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Question 1056249: For the following problem, y varies inversely as the square of x.
If y = 81 when x = 9, find y when x is 3
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
y varies inversely as the square of x.

If y = 81 when x = 9, 
Substitute that in



Solve for k



Multiply both sides by 81



Substitute that in 



  <-- that's the formula

find y when x is 3
Substitute 3 for x







Edwin
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