Combinatie
\(\left\{\begin{matrix}-7x-10y=-4\\-4x=-7y+74\end{matrix}\right.\)
\(\left\{\begin{matrix}-7x-10y=-4\\-4x=-7y+74\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-7x-10y=-4\\-4x+7y=74\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}-7x-10y=-4& \color{red}{4.} & \color{blue}{7.} \\-4x+7y=74& \color{red}{-7.} & \color{blue}{10.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{-28x+28x}-40y-49y=-16-518} \\ \color{blue}{-49x-40x\underline{-70y+70y}=-28+740} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-89y=-534 \\-89x=712\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{-534}{-89}=6 \\x=\frac{712}{-89}=-8\end{matrix}\right.\\ \qquad V=\{(-8,6)\}\)
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