Answer
$m=0$
Work Step by Step
Using the properties of equality, the given equation, $
y-3=0
,$ is equivalent to
\begin{array}{l}
y=3
.\end{array}
All linear equations of the form $y=b$, where $b$ is any real number, have a slope of $0$. Hence, the slope of the given equation is $
m=0
.$
