100(x+1)=2(y+5)即 50(x+1)=(y+5) (1式) 100(x+1)+y+10=209即 100(x+1)+(y+5)+5=209 将①式代入即 100(x+1)+50(x+1)-204=0解方程 10(x+1)=12解的x=0.2 10(x+1)=-17(不合题意舍)
100(x+1)=2(y+5) 100(x+1)+y+10=209
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