3x-5y=-1 2x=3y
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3x-5y=-12x=3y3x-5y=-12x=3y3x-5y=-12x=3y2x=3yx=1.5y3x1.5y-5y=-1-0.5y=-1y=2x=1.5x2=32x=3yy=2x/3代入3x-5y
3x-5y=-1 2x=3y
3x-5y=-1 2x=3y
3x-5y=-1 2x=3y
2x=3y
x=1.5y
3x1.5y-5y=-1
-0.5y=-1
y=2
x=1.5x2=3
2x=3y
y=2x/3
代入3x-5y=-1
3x-10x/3=-1
-x/3=-1
所以
x=3
y=2x/3=2
X=3 Y=2
x=3y/2 代入前式
9y/2-5y=-1
y=2
x=3
x=3,y=2
x=3 y=2
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