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I don't understand why it is equivalent to $x=z$ and $x\neq0$, and not equivalent to:

$x=z$, $x\neq0$ and $y\neq0$. $y$ can't be equal to $0$ in order for $R^2$ to be true.

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    You have asked multiple such questions. Are you just asking to answers for homework problems?2012-12-06
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    just some review questions2012-12-06
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    what is exactly your questions?2012-12-06
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    Also, it would almost certainly be better for you to provide some of your own work so that we can help you.2012-12-06
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    it's not really a homework question, it's just a theoretical question.2012-12-06

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