Combinatie
\(\left\{\begin{matrix}-3x+6y=66\\-10y-7x=-62\end{matrix}\right.\)
\(\left\{\begin{matrix}-3x+6y=66\\-10y-7x=-62\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-3x+6y=66\\-7x-10y=-62\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}-3x+6y=66& \color{red}{7.} & \color{blue}{5.} \\-7x-10y=-62& \color{red}{-3.} & \color{blue}{3.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{-21x+21x}+42y+30y=462+186} \\ \color{blue}{-15x-21x\underline{+30y-30y}=330-186} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}72y=648 \\-36x=144\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{648}{72}=9 \\x=\frac{144}{-36}=-4\end{matrix}\right.\\ \qquad V=\{(-4,9)\}\)
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