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Solve the Pair of Linear Equations by Addition 4x+9y=129x4y=27\begin{array} { l } 4 x + 9 y = 12 \\9 x - 4 y = 27\end{array}

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Solve the pair of linear equations by addition. 4x+9y=129x4y=27\begin{array} { l } 4 x + 9 y = 12 \\9 x - 4 y = 27\end{array}

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