## Precalculus (6th Edition)

$C$
RECALL: (1) The graph of the equation of the form $x=a$ is a vertical line. (2) The graph of the equation of the form $y=k$ is a horizontal line. The given equation is in the form $y=k$ where $k=-5$. Thus, its graph is a horizontal line. Since $k$ is negative, then the horizontal line is below the x-axis. Therefore, the answer is Option C.