If \(x\) and \(y\) are positive, is \(81^3=27^{y-x}?\)

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If \(x\) and \(y\) are positive, is \(81^3=27^{y-x}?\)

(1) \(|y-x|=4\)

(2) \(2^y=8^x\)

Answer: C

Source: Manhattan GMAT