Answer
$y = 3~sec~\frac{\pi}{2}x$
We can see the graph below.
Work Step by Step
$y = 3~sec~\frac{\pi}{2}x$
When $x = -1$, then $y = 3~sec~\frac{-\pi}{2}$ (which is undefined)
When $x = 0$, then $y = 3~sec~0 = 3$
When $x = 1$, then $y = 3~sec~\frac{\pi}{2}$ (which is undefined)
When $x = 2$, then $y = 3~sec~\pi = -3$
When $x = 3$, then $y = 3~sec~\frac{3\pi}{2}$ (which is undefined)
We can see the graph below.
