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

分类: 作业答案 • 2023-01-23 15:07:48

问题描述：

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

答

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