x-2y=-1.........(1)x:2=y:3.........(2)(2)：2y=3xy=3/2x..........(3)(3)代入(1)：x-2(3/2x)=-1x-3x=-1-2x=-1x=1/2代入(3)：y=3/2(1/2)=3/4
X=1/2 Y=3/4
