Answer
$y=\frac{520}{3}-x$
$A=x(\frac{520}{3}-x)$
Work Step by Step
$Perimeter=2(x+y)$
$\frac{1040}{3}=2(x+y)$
$\frac{\frac{1040}{3}}{2}=x+y$
$\frac{520}{3}=x+y$
$\frac{520}{3}-x=y$
$A=xy$
$A=x(\frac{520}{3}-x)$
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