Solve for \( x \) and \( y \) by substitution method. \[ a x+b y=1 ; b x+a y=\frac{2 a b}{a^{2}+...

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Solve for \( x \) and \( y \) by
substitution method.
\[
a x+b y=1 ; b x+a y=\frac{2 a b}{a^{2}+b^{2}}
\]
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