Combinatie
\(\left\{\begin{matrix}-2y-8x=-20\\-6x+6y=0\end{matrix}\right.\)
\(\left\{\begin{matrix}-2y-8x=-20\\-6x+6y=0\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-8x-2y=-20\\-6x+6y=0\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}-8x-2y=-20& \color{red}{3.} & \color{blue}{3.} \\-6x+6y=0& \color{red}{-4.} & \color{blue}{1.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{-24x+24x}-6y-24y=-60+0} \\ \color{blue}{-24x-6x\underline{-6y+6y}=-60+0} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-30y=-60 \\-30x=-60\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{-60}{-30}=2 \\x=\frac{-60}{-30}=2\end{matrix}\right.\\ \qquad V=\{(2,2)\}\)
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