Combinatie
\(\left\{\begin{matrix}-2x+4y=-6\\-7x+7y=7\end{matrix}\right.\)
\(\left\{\begin{matrix}-2x+4y=-6\\-7x+7y=7\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{array}{c|c|c}-2x+4y=-6& \color{red}{7.} & \color{blue}{7.} \\-7x+7y=7& \color{red}{-2.} & \color{blue}{-4.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{-14x+14x}+28y-14y=-42-14} \\ \color{blue}{-14x+28x\underline{+28y-28y}=-42-28} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}14y=-56 \\14x=-70\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{-56}{14}=-4 \\x=\frac{-70}{14}=-5\end{matrix}\right.\\ \qquad V=\{(-5,-4)\}\)
Oefeningengenerator
vanhoeckes.be/wiskunde 2025-04-03 05:55:35