用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)

问题描述:

用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)
正确答案是y=7,x=5...
就差这一道了。写完才可以go to bed

3(x-1)=y+5 ,3x-3=y+5……(1)
5(y-1)=3(x+5),5y-5=3x+15……(2)
(2)-(1)
18=4y-10,y=7,x=5