a) 5x-y=6 2x+y=1 b)3x-8y=2 2x+2y=-6
1个回答
a) 5x-y=6 2x+y=1
7x=7;
x=1;
y=-1;
b)3x-8y=2
2x+2y=-6
8x+8y=-24;
11x=-22;
x=-2;
y=-1;
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