2(x+y)-10=4x (1+10%)x+(1+15%)y=17解方程组2(x+y)-10=4x (1+10%)x+(1+15%)y=17

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2(x+y)-10=4x (1+10%)x+(1+15%)y=17解方程组2(x+y)-10=4x (1+10%)x+(1+15%)y=17

2(x+y)-10=4x (1+10%)x+(1+15%)y=17解方程组2(x+y)-10=4x (1+10%)x+(1+15%)y=17
2(x+y)-10=4x (1+10%)x+(1+15%)y=17解方程组
2(x+y)-10=4x
(1+10%)x+(1+15%)y=17

2(x+y)-10=4x (1+10%)x+(1+15%)y=17解方程组2(x+y)-10=4x (1+10%)x+(1+15%)y=17
化简
-X+Y=5 (1)
22X+23Y=340 (2)
22*(1)+(2),得
45Y=450
Y=10
代入（1）,得
-X+10=5
X=5