-2x+y=-3 3x+2y=8
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-2x+y=-33x+2y=8-2x+y=-33x+2y=8-2x+y=-33x+2y=8-2x+y=-3…………①3x+2y=8…………②②-①×2得7x=14x=2把x=2带入①得-4+y=-3y
-2x+y=-3 3x+2y=8
-2x+y=-3 3x+2y=8
-2x+y=-3 3x+2y=8
-2x+y=-3…………①
3x+2y=8…………②
②-①×2得
7x=14
x=2
把x=2带入①得
-4+y=-3
y=1
∴x=2,y=1
①式X2 -4x+2y=-6
②式 减去上面的式子
7x=14
x=2
y=-3+2x=1
-2x+y=-3 (1)
3x+2y=8 (2)
由(1)得y=2x-3
代入(2)
3x+4x-6=8
7x=14
所以
x=2
y=2x-3=1
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