bài 6
\(a,\left\{{}\begin{matrix}3x-y=5\\5x+2y=23\end{matrix}\right.=>\left\{{}\begin{matrix}6x-2y=10\\5x+2y=23\end{matrix}\right.=>\left\{{}\begin{matrix}11x=33\\3x-y=5\end{matrix}\right.=>\left\{{}\begin{matrix}x=3\\3.3-y=5\end{matrix}\right.=>\left\{{}\begin{matrix}x=3\\y=4\end{matrix}\right.\)
\(b,\left\{{}\begin{matrix}3x+5y=1\\2x-y=-8\end{matrix}\right.=>\left\{{}\begin{matrix}3x+5y=1\\10x-5y=-40\end{matrix}\right.=>\left\{{}\begin{matrix}13x=-39\\3x+5y=1\end{matrix}\right.=>\left\{{}\begin{matrix}x=-3\\3.\left(-3\right)+5y=1\end{matrix}\right.=>\left\{{}\begin{matrix}x=-3\\y=2\end{matrix}\right.\)
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