\(hpt\Leftrightarrow\left\{{}\begin{matrix}-2y=6\\x-5y=16\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}y=-3\\x=16+5y\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=-3\end{matrix}\right.\)
\(\left\{{}\begin{matrix}-x+3y=-10\\x-5y=16\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x-3y=10\\x-5y=16\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x-3y-x+5y=10-16\\x-5y=16\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}2y=-6\\x-5y=16\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}y=-3\\x-5\left(-3\right)=16\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}y=-3\\x=1\end{matrix}\right.\)
