Answer
The slope is $0$.
The $y$-intercept is $5$.
See the graph below.
Work Step by Step
For a horizontal line, its equation's form is always the following:
$y=a$, where $a$ is a constant.
Here, the equation $y=5$ is exactly as described above with $a=5$.
Therefore the line is horizontal.
Recall that a horizontal line has a slope of $0$.
Every point that has a $y$-coordinate of $5$ is on the line $y=5$.
Therefore, the $y$-intercept is $5$.
In order to sketch the line we can use the points $(0,5)$ and $(1,5)$.
Plot the points and connect them using a straight line.
Refer to the graph above.
