Answer
(a) See the graph.
(b) $(-\frac{3\sqrt 2}{2},\frac{3\sqrt 2}{2})$
Work Step by Step
(b)
$x=r~cos~θ$
$x=-3~cos~\frac{7\pi}{4}=-3(\frac{\sqrt 2}{2})=-\frac{3\sqrt 2}{2}$
$y=r~sin~θ$
$y=-3~sin~\frac{7\pi}{4}=-3(-\frac{\sqrt 2}{2})=\frac{3\sqrt 2}{2}$
