Solve for x and y, when

Question:

Solve for $x$ and $y$, when

$\left[\begin{array}{cc}3 & -4 \\ 1 & 2\end{array}\right]\left[\begin{array}{l}x \\ y\end{array}\right]=\left[\begin{array}{l}3 \\ 11\end{array}\right]$

 

Solution:

 

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