#### Answer

slope is undefined;
line has no y-intercept
Refer to the image below for the graph.

#### Work Step by Step

RECALL:
(1) The slope-intercept form of a line's equation is:
$y=mx+b$
where $m$ = slope and $b$ = y-intercept
(2) A vertical line has an undefined slope.
The equation of the line is in the form $x=h$ where $h$ is the x-intercept.
Every point on this line has an x-coordinate of $x=h$.
Thus, the given equation $x=-4$ is a vertical line with an undefined slope.
Since the line is vertical with an x-intercept of $-4$, the line has no y-intercept.
To graph the line, perform the following steps:
(1) Plot the x-intercept point $(-4, 0)$.
(2) Plot another point with an x-coordinate of $-4$.
(3) Complete the graph by connecting the two points using a straight line.
(refer to the attached image in the answer part above for the graph)