+0

# help

+1
98
1

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

Jun 3, 2019

#1
+5621
+1

$$xy=9 \Rightarrow x \neq 0\\ y=\dfrac 9 x\\ x+y = x + \dfrac 9 x \in \mathbb{R}-\{0\}$$

.
Jun 3, 2019