8x+4y=2 6x+5y+7=0
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8x+4y=2 6x+5y+7=0
8x+4y=2 6x+5y+7=0
8x+4y=2 6x+5y+7=0
8x+4y=2 6x+5y+7=0
4x+2y=1 (1)
6x+5y=-7 (2)
(2)*2-(1)*3得:
4y=-17 即y=-17/4
代入(1)(2)x=19/8
所以 x=19/8 y=-17/4
已知|5x-y-8|+(7y-x+2)=0则4x+6y
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