\(\left\{{}\begin{matrix}-2x+y=-5\\x-y=3\end{matrix}\right.\) <=> \(\left\{{}\begin{matrix}-x=-2\\-2x+y=5\end{matrix}\right.\) <=> \(\left\{{}\begin{matrix}x=2\\-4+y=5\end{matrix}\right.\)
<=> \(\left\{{}\begin{matrix}x=2\\y=9\end{matrix}\right.\)
Vậy hot có ngiệm day nhất \(\left(x,y\right)=\left(2,9\right)\)