2y=-x+400 y=-2x+500 求X Y
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2y=-x+400 y=-2x+500 求X Y
![2y=-x+400 y=-2x+500 求X Y](/uploads/image/z/18721318-22-8.jpg?t=2y%3D-x%2B400+y%3D-2x%2B500+%E6%B1%82X+Y)
y=-2x+500
代入2y=-x+400
-4x+1000=-x+400
3x=600
所以
x=200
y=-2x+500=100
代入2y=-x+400
-4x+1000=-x+400
3x=600
所以
x=200
y=-2x+500=100
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