Manipulating Exponent

Algebra Level 1

\[ \begin{eqnarray} \large \color{purple} {3^x} & = & \color{blue}{2^{2015}} \\\\ \large \color{blue}{2^{2015y}} & = & 81 \\\\ \large \color{green}{xy} & = & \ \color{teal} ? \end{eqnarray} \]

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