Combinatie
\(\left\{\begin{matrix}4y=-50-7x\\3x+8y=-34\end{matrix}\right.\)
\(\left\{\begin{matrix}4y=-50-7x\\3x+8y=-34\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}7x+4y=-50\\3x+8y=-34\end{matrix}\right.\text{(Niet verplichte stap, proper schrijven)}\\ \Leftrightarrow \left\{\begin{array}{c|c|c}7x+4y=-50& \color{red}{3.} & \color{blue}{2.} \\3x+8y=-34& \color{red}{-7.} & \color{blue}{-1.} \end{array}\right.\\ \Leftrightarrow \left\{\begin{matrix} \color{red}{\underline{21x-21x}+12y-56y=-150+238} \\ \color{blue}{14x-3x\underline{+8y-8y}=-100+34} \end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}-44y=88 \\11x=-66\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}y=\frac{88}{-44}=-2 \\x=\frac{-66}{11}=-6\end{matrix}\right.\\ \qquad V=\{(-6,-2)\}\)
Oefeningengenerator
vanhoeckes.be/wiskunde 2025-04-02 03:15:24