Combinatie
\(\left\{\begin{matrix}-4y+9x=-100\\-7x+8y=112\end{matrix}\right.\)
\(\left\{\begin{matrix}-4y+9x=-100\\-7x+8y=112\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}9x-4y=-100\\-7x+8y=112\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}9x-4y=-100& \color{red}{7.} & \color{blue}{2.} \\-7x+8y=112& \color{red}{9.} & \color{blue}{1.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{63x-63x}-28y+72y=-700+1008} \\ \color{blue}{18x-7x\underline{-8y+8y}=-200+112} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}44y=308 \\11x=-88\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{308}{44}=7 \\x=\frac{-88}{11}=-8\end{matrix}\right.\\ \qquad V=\{(-8,7)\}\)
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