## Intermediate Algebra (12th Edition)

$m=0$
$\bf{\text{Solution Outline:}}$ To find the slope and the graph of the given equation, $y=-4 ,$ use the slope and graph of lines in the form $y=b.$ $\bf{\text{Solution Details:}}$ Since lines of the form $y=b$ (where $b$ is a constant) have a slope of $0,$ then the slope of the line defined by the given equation is \begin{array}{l}\require{cancel} m=0 .\end{array} The graph of lines in the form $y=b$ is a horizontal line that passes through the $y$-axis at $b.$