Combinatie
\(\left\{\begin{matrix}9x-6y=-60\\10x+10y=50\end{matrix}\right.\)
\(\left\{\begin{matrix}9x-6y=-60\\10x+10y=50\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{array}{c|c|c}9x-6y=-60& \color{red}{10.} & \color{blue}{5.} \\10x+10y=50& \color{red}{-9.} & \color{blue}{3.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{90x-90x}-60y-90y=-600-450} \\ \color{blue}{45x+30x\underline{-30y+30y}=-300+150} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-150y=-1050 \\75x=-150\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{-1050}{-150}=7 \\x=\frac{-150}{75}=-2\end{matrix}\right.\\ \qquad V=\{(-2,7)\}\)
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