1) X-Y=1 Y=3/4X+12) Y=4X Y=-3X3) 3X+Y=6 2X+Y=3/24) X+4Y=-1/2 -2X-3Y=15) X-Y=-3/2 -2X+5Y=-4.5

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1)X-Y=1Y=3/4X+12)Y=4XY=-3X3)3X+Y=62X+Y=3/24)X+4Y=-1/2-2X-3Y=15)X-Y=-3/2-2X+5Y=-4.51)X-Y=1Y=3/4X+12)Y

1) X-Y=1 Y=3/4X+12) Y=4X Y=-3X3) 3X+Y=6 2X+Y=3/24) X+4Y=-1/2 -2X-3Y=15) X-Y=-3/2 -2X+5Y=-4.5
1) X-Y=1 Y=3/4X+1
2) Y=4X Y=-3X
3) 3X+Y=6 2X+Y=3/2
4) X+4Y=-1/2 -2X-3Y=1
5) X-Y=-3/2 -2X+5Y=-4.5

1) X-Y=1 Y=3/4X+12) Y=4X Y=-3X3) 3X+Y=6 2X+Y=3/24) X+4Y=-1/2 -2X-3Y=15) X-Y=-3/2 -2X+5Y=-4.5
⑴将y=3/4x+1代入x-y=1 得x=8 y=7
⑵两式相减,得x=0 y=0
⑶两式相减,得x=9/2 y=-15/2
⑷将式1乘2,得2x+8y=-1 再将两式相加,得y=0 x=-1/2
⑸将式1乘2,得2x-2y=-3 再将两式相加,得y=-5/2 x=-4

1) x-(3/4x+1)=1, 1/4x=2, x=4, y=7
2) x=0, y=0
3)(3x-2x)+ (y-y)=6-3/2, x=4 1/2, y=7 1/2
4) x=-1/2-4y, 2x(1/2+4y)-3y=1, 8y=0, y=0, x=-1/2
5) 2x-2y = -3, 2x+(-2x)+(-2y+5y)=-7.5, 3y=-7.5, y=-2.5, x=1

1) x＝8, y＝7
2) x＝y＝0
3) x＝9/2, y＝-15/2
4) x＝-1/2, y＝0
5) x＝-4, y＝-5/2

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