若2X+3Y-1=Y-X-8=X+6则2X+Y=
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若2X+3Y-1=Y-X-8=X+6则2X+Y=
![若2X+3Y-1=Y-X-8=X+6则2X+Y=](/uploads/image/z/3664168-16-8.jpg?t=%E8%8B%A52X%2B3Y-1%3DY-X-8%3DX%2B6%E5%88%992X%2BY%3D)
2X+3Y-1=X+6
2X+3Y=7 (1)
Y-X-8=X+6
2X-Y=-14 (2)
(1)+(2)
4X+2Y=-7
两边除以2
2X+Y=-7/2
2X+3Y=7 (1)
Y-X-8=X+6
2X-Y=-14 (2)
(1)+(2)
4X+2Y=-7
两边除以2
2X+Y=-7/2
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