Answer
$-2$;
$\dfrac{1}{2}$
Work Step by Step
Write the given equation in the form $y=mx+b$ where m=slope and b=y-intercept to obtain:
$y=-2x+6$
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 $-2$.
Thus:
(1) Any line that is parallel to the given line has a slope of $-2$.
(2) Any line that is perpendicular to the given line has a slope of $\frac{1}{2}$.
Therefore, the missing expressions in the given statements are $-2$ and $\frac{1}{2}$, respectively.
