Answer
slope is undefined;
no y-intercept
Refer to the image below for the graph.
Work Step by Step
RECALL:
The graph of an equation in the form $x=h$ is a vertical line.
It has an undefined slope and has $h$ as its x-intercept.
All the points on the graph of this line have $h$ as their x-coordinate.
Thus, the graph of $x=3$ is a vertical line, has an x-intercept of $3$, and all the points on the line have $3$ as their x-coordinate.
Plot the x-intercept point $(3, 0)$.
Plot another point whose x-coordinate is $3$. (e.g., $(3, 3)$).
Then, connect the two points together using a straight line.
(refer to the attached image in the answer part above)
Note that the line has no y-intercept.
