Combinatie
\(\left\{\begin{matrix}6x-5y=-88\\-5x+6y=88\end{matrix}\right.\)
\(\left\{\begin{matrix}6x-5y=-88\\-5x+6y=88\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{array}{c|c|c}6x-5y=-88& \color{red}{5.} & \color{blue}{6.} \\-5x+6y=88& \color{red}{6.} & \color{blue}{5.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{30x-30x}-25y+36y=-440+528} \\ \color{blue}{36x-25x\underline{-30y+30y}=-528+440} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}11y=88 \\11x=-88\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{88}{11}=8 \\x=\frac{-88}{11}=-8\end{matrix}\right.\\ \qquad V=\{(-8,8)\}\)
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