Combinatie
\(\left\{\begin{matrix}3y=-27+6x\\-9x-8y=-78\end{matrix}\right.\)
\(\left\{\begin{matrix}3y=-27+6x\\-9x-8y=-78\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-6x+3y=-27\\-9x-8y=-78\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}-6x+3y=-27& \color{red}{3.} & \color{blue}{8.} \\-9x-8y=-78& \color{red}{-2.} & \color{blue}{3.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{-18x+18x}+9y+16y=-81+156} \\ \color{blue}{-48x-27x\underline{+24y-24y}=-216-234} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}25y=75 \\-75x=-450\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{75}{25}=3 \\x=\frac{-450}{-75}=6\end{matrix}\right.\\ \qquad V=\{(6,3)\}\)
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