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x=1,y=-1代入ax+by=-2得a-b=-2,x=2,y=2代入得2a+2b=2,把兩方式组成一起,解得a=-1/2,b=3/2,所以原方程式就變了-0.5x+1.5y=-2,當時把x=3,y=5,代入,看方程式左右相不等相就行
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