7x-3y=-1 10x+3y+1=0 4x-5y=-17 4x+5y+8=0
1个回答
由7x-3y+1=0有x=(3y-1)/7
带入4x-5y=-17
得x=2
y=5
相关问题
{7x-3y+1=0,4x-5y+17=0
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