x+y=8 10y+x=10x-y-36

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x+y=8 10y+x=10x-y-36
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x+y=8 10y+x=10x-y-36
x+y=8 10y+x=10x-y-36

x+y=8 10y+x=10x-y-36
x+y=8①
10y+x=10x-y-36
整理：11y-9x=-36②
由①得x=8-y代入②
11y-9(8-y)=-36
11y-72+9y=-36
20y=36
y=9/5
∴x=8-9/5=31/5

x+y=8①
9x-11y=36②
①×9-②得20y=36,y=9/5
①×11+②得20x=124,,x=31/5

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