Say x=y

Therefore

x² = xy.

So if you take the same from both sides.

x² - y² = xy - y².

Now divide both sides by  (x-y)

We get

x + y = y

Now as x=y we can say.

2y=y

Divide by y

We get 2=1

Subtract 1from both we get

1=0.

So what is the problem with the proof? Answer tomorrow