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Just For Fun Quiz / Find the Mistake: 2=1 Proof

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Can you name the mistake in this proof that 2=1?

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ProofWhere is it?Explanation
Do this!It is required!
1. x=y≠0Given
2. x^2=xyMultiply by x
3. x^2-y^2=xy-y^2Subtract y^2
4. (x+y)(x-y)=y(x-y)Factoring
5. x+y=yDividing by x-y
6. y+y=ySubstitution: x=y
7. 2y=yCombining like terms
8. 2=1Dividing by y, knowing y≠0
Is there any mistake in the proof?(Fills in upon completion of the quiz)
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