\(1,\left\{{}\begin{matrix}5x+2y=7\\2x-3y=18\end{matrix}\right.\\ \left\{{}\begin{matrix}10x+4y=14\\10-15y=90\end{matrix}\right.\\\left\{{}\begin{matrix}19y=-76\\2x-3y=18\end{matrix}\right. \\ \left\{{}\begin{matrix}y=-4\\x=3\end{matrix}\right.\\ 2,\left\{{}\begin{matrix}4x-3y=15\\2x-5y=11\end{matrix}\right.\\ \left\{{}\begin{matrix}4x-3y=15\\4x-10y=22\end{matrix}\right.\\ \left\{{}\begin{matrix}7y=-7\\4x-3y=15\end{matrix}\right.\\ \left\{{}\begin{matrix}y=-1\\x=3\end{matrix}\right.\)
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