Combinatie
\(\left\{\begin{matrix}-7x-8y=50\\3x+3y=-21\end{matrix}\right.\)
\(\left\{\begin{matrix}-7x-8y=50\\3x+3y=-21\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{array}{c|c|c}-7x-8y=50& \color{red}{3.} & \color{blue}{3.} \\3x+3y=-21& \color{red}{7.} & \color{blue}{8.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{-21x+21x}-24y+21y=150-147} \\ \color{blue}{-21x+24x\underline{-24y+24y}=150-168} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-3y=3 \\3x=-18\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{3}{-3}=-1 \\x=\frac{-18}{3}=-6\end{matrix}\right.\\ \qquad V=\{(-6,-1)\}\)
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