Answer
See below.
Work Step by Step
a. Domain: The domain is set of all $(x,y)$ satisfying $x \ne 0$ .
b. Range: $R: \dfrac{-\pi}{2} \leq z\leq \dfrac{\pi}{2}$
c. Level Curves: These are the straight lines $y=cx$ (where $c$ is any real number and $x \ne 0$).
d. Boundary is the vertical line $x=0$
e. Open
f. Unbounded
