解:将$(1)$代入$(2)$得$n=1， $代入$(1)$得$m=2，$ 所以$ \left\{\begin{array}{l}m=2, \\ n=1\end{array}\right. $ $解:将(2)代入(1)得a=1,代入(2)得b=1,$ $所以 \left\{\begin{array}{l}a=1, \\ b=1\end{array}\right. $ $解:由(1)得x=17-y,代入(2)得y=5, $ $所以x=12,$ $所以\left\{\begin{array}{l}x=12 \\ y=5\end{array}\right. $ $解:由(1)得y=1-2x,代入(2)得x=-1, 所以y=3,$ $所以\left\{\begin{array}{l}x=-1, \\ y=3\end{array}\right. $ $解:由(1)得y=7-2x, 代入(2)得x=2, $ $所以y=7-2x=3,$ $所以\left\{\begin{array}{l}x=2, \\ y=3\end{array}\right. $ $解:由(2)得y=3x-2, 代入(1)得x=1, $ $所以y=3x-2=1,$ $所以\left\{\begin{array}{l}x=1, \\ y=1\end{array}\right. $ $解:由(2)得x=4y-5,代入(1)得y=1,$ $所以x=4y-5=-1,$ $所以\left\{\begin{array}{l}x=-1 \\ y=1\end{array}\right. $ $解:由(1)的y=\frac {5-7x}{3},代入(2)得x=2,$ $所以y=\frac {5-7x}{3}=-3,$ $所以\left\{\begin{array}{l}x=2, \\ y=-3\end{array}\right. $
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