2x-1=y+2/3 2x-y=2/3+1 2x-y=5/3
y-1/2=y-x y-y+x=1/2 x=1/2
2*(1/2)-y=5/3 1-y=5/3 y=1-5/3=-2/3
请采纳答案,支持我一下.