Combinatie
\(\left\{\begin{matrix}2x+7y=48\\-6x=4y-76\end{matrix}\right.\)
\(\left\{\begin{matrix}2x+7y=48\\-6x=4y-76\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}2x+7y=48\\-6x-4y=-76\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}2x+7y=48& \color{red}{3.} & \color{blue}{4.} \\-6x-4y=-76& \color{red}{1.} & \color{blue}{7.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{6x-6x}+21y-4y=144-76} \\ \color{blue}{8x-42x\underline{+28y-28y}=192-532} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}17y=68 \\-34x=-340\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{68}{17}=4 \\x=\frac{-340}{-34}=10\end{matrix}\right.\\ \qquad V=\{(10,4)\}\)
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