解下列方程组(1) x-y=2 x+1=2(y-1) (2) 6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1

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解下列方程组(1) x-y=2 x+1=2(y-1) (2) 6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1
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解下列方程组(1) x-y=2 x+1=2(y-1) (2) 6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1
解下列方程组(1) x-y=2 x+1=2(y-1) (2) 6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1

解下列方程组(1) x-y=2 x+1=2(y-1) (2) 6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1
(1) x=7,y=5;
(2) x=5,y=-2

(1)x-y=2(y-1) x-y=2y-2 x=3y+1 y=1/4-2)+1=2y-2
6y-4+1=2y-2
2(3y