3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2

问题描述:

3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2

6x+3y+4x-2y=6
10x+y=6 (1)
8x+4y-10x+5y=2
2x-9y=-2 )2)
(1)×9+(2)
90x+2x=54-2
92x=52
所以x=13/23
y=6-10x=8/23