y/3-(x+1)/6=3 2(x-y/2)=3(x+y/18)化简后y = 9+(x+1)/20 = 6x+7y所以 x= -7y=6
一式化简:2y-x=19; 二式化简:7y+6x=0;将一式x=2y-19带入二式得,12y-114=0,得y=6,则x=7.
x=7 y=6