5x-9y=2 x-2y=5

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5x-9y=2 x-2y=5
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5x-9y=2 x-2y=5
5x-9y=2 x-2y=5

5x-9y=2 x-2y=5
由5x-9y=5得
x=1+9y/5
代入2x-2y=5得
2+18y/5-2y=5计算得
y=15/8
代入x=1+9y/5得
x=35/8

5x-9y=2 ①
x-2y=5 ②
②×5得5x-10y=25③
①-③得
y=-23
x=-41

5x-9y=2 （1）
x-2y=5 （2）
将x=5+2y带入（1）中，5（5+2y）-9y=2,解得：
y=-23,带入（2）中，得：x=-41

X=-41Y=-23

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