Combinatie
\(\left\{\begin{matrix}-9x-3y=18\\6x=-2y-12\end{matrix}\right.\)
\(\left\{\begin{matrix}-9x-3y=18\\6x=-2y-12\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-9x-3y=18\\6x+2y=-12\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}-9x-3y=18& \color{red}{2.} & \color{blue}{2.} \\6x+2y=-12& \color{red}{3.} & \color{blue}{3.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{-18x+18x}-6y+6y=36-36} \\ \color{blue}{-18x+18x\underline{-6y+6y}=36-36} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}0y=0 \\0x=0\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{0}{0}=-9 \\x=\frac{0}{0}=1\end{matrix}\right.\\ \qquad V=\{(1,-9)\}\)
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