2x-3y=10 x+y=0 x=?y=?
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2x-3y=10 x+y=0 x=?y=?
2x-3y=10 x+y=0 x=?y=?
2x-3y=10 x+y=0 x=?y=?
2x-3y=10
x+y=0
2x-3y=10
3x+3y=0
2x+3x=10
x=2
y=-x=-2
x=2,y=-2
2x-3y=10 ①
x+y=0,则y=-x②
将②代入①,得2x+3x=10,解得x=2
代入②,得y=-2
所以x=2,y=-2
x=2 y=-2
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