
X=Y ; Given

X^2=XY ; Multiply both sides by X

X^2Y^2=XYY^2 ; Subtract Y^2 from both sides

(X+Y)(XY)=Y(XY) ; Factor

X+Y=Y ; Cancel out (XY) term

2Y=Y ; Substitute X for Y, by equation 1

2=1 ; Divide both sides by Y
 Proof that 2 equals 1
whats the problem here , it left me totally dumbfounded