#### Answer

$-\frac{1}{3}$;
$3$

#### Work Step by Step

RECALL:
For nonvertical lines:
(1) Two lines are parallel if they have the same or equal slope.
(2) Two lines are perpendicular if their slopes have a product of $-1$
The given line has a slope of $-\frac{1}{3}$.
Thus:
(1) Any line that is parallel to the given line has a slope of $-\frac{1}{3}$.
(2) Any line that is perpendicular to the given line has a slope of $3$.
Therefore, the missing expressions in the given statements are $-\frac{1}{3}$ and $3$, respectively.