#### Answer

Refer to the image below for the graph.

#### Work Step by Step

RECALL:
(1) The graph of the equation $x=h$ is a vertical line whose x-intercept is $h$.
(2) The graph of the equation $y=k$ or $f(x) =k$ is a horizontal line whose y-intercept is $k$.
The given equation is similar to the form in (2) above.
Thus, its graph is a horizontal line whose y-intercept is $4$.
(refer to the attached image in the answer part above for the graph)