解x-y=50,y-70=3\5(x+70)+10
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解x-y=50,y-70=3\5(x+70)+10
解x-y=50,y-70=3\5(x+70)+10
解x-y=50,y-70=3\5(x+70)+10
1、y=x-50
2、代入y-70=3\5(x+70)+10
4、得2/5x=172
5、 解得x=430 y=380
x-y=50 (1)
y-70=3\5(x+70)+10 (2)
(1)+(2) ----> x-70=3\5(x+70)+60
----> x=430
代入(1)式 ---->y=380
y=x-50 代入y-70=3\5(x+70)+10得2/5x=172 解得x=430 y=380
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