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![\left[\begin{array}{ccc}1&1\\2&3\end{array}\right]\ \left[\begin{array}{ccc}x\\y\end{array}\right] =\left[\begin{array}{ccc}8\\36\end{array}\right]\\ \left[\begin{array}{ccc}1x+1y\\2x+3y\end{array}\right] =\left[\begin{array}{ccc}8\\36\end{array}\right]\to\left\{\begin{array}{ccc}x+y=8&|\cdot(-2)\\2x+3y=36\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}-2x-2y=-16\\2x+3y=36\end{array}\right}\ |\text{add both sides of equations}\\.\ \ \ \ \ \ \ \ \ \ y=20](/tpl/images/0087/9189/ae753.png)
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