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Let \(x\) and \(y\) be real numbers such that \(xy=9\). Find the set of all possible values of \(x+y\).

 Jun 3, 2019
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\(xy=9 \Rightarrow x \neq 0\\ y=\dfrac 9 x\\ x+y = x + \dfrac 9 x \in \mathbb{R}-\{0\}\)

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 Jun 3, 2019

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