Help me. Please help me find the right domain. Help me find range and graph. Thank you!
The domain is actually $\displaystyle \mathbf{R}$.
If you were to graph this, you would have a horizontal graph $\displaystyle y = -6$ ending at $\displaystyle x = -3$, a horizontal graph $\displaystyle y = 6$ starting at $\displaystyle x = 3$, and joined with a "diagonal" line $\displaystyle y = 2x$.
So for what values of $\displaystyle y$ is this function defined?