x+y=32,2x+4y=100
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x+y=32,2x+4y=100x+y=32,2x+4y=100x+y=32,2x+4y=100x+y=32(1),2x+4y=100(2)(2)-(1)×2得：4y-2y=100-64;2y=36;
x+y=32,2x+4y=100
x+y=32,2x+4y=100
x+y=32,2x+4y=100
x+y=32(1),
2x+4y=100(2)
(2)-(1)×2得：
4y-2y=100-64;
2y=36;
y=18;
带入（1）得：
x=32-18;
x=14;
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x+y=32
2x+4y=100 ----- x+2y=50
两式相减 (下面减上面) 得到 y = 18
再代回去得到x = 14
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