alirollins05 alirollins05
  • 29-09-2017
  • Mathematics
contestada

Find y when x=9 if y varies directly as the square of x and y=245 when x=7

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caylus
caylus caylus
  • 29-09-2017
Hello,

y=k*x²
if x=7 then y=245=k*7²==>k=245/49=5

So y=5x²
If x=9 then y=5*9²=405

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