x-y=2
x-2=y
2y^2+y-4=0
2y^2=4-y
y^2=2-y/2
x/y-y
=(x-y^2)/y
=[x-(2-y/2)]/y
=[(x-2)+y/2]/y
=(y+y/2)/y
=(3y/2)/y
=3/2