3x=4(x-y) x-8(x-y)=5

问题描述:

3x=4(x-y)
x-8(x-y)=5

先化简,得:X=4Y,8Y-7X=5,前式代入后式,得8Y-28Y=5,Y=-1/4,那么,X=-1

x-8*3x/4=5
x-6x=5
x=-1
y=-1/4