Answer
$m=0$
Work Step by Step
Using $m=\dfrac{y_1-y_2}{x_1-x_2}$ or the Slope Formula, the slope of the line passing through the given points $(
5,9
)$ and $(
-2,9
)$ is
\begin{array}{l}\require{cancel}
m=\dfrac{9-9}{5-(-2)}
\\\\
m=\dfrac{0}{5+2}
\\\\
m=0
.\end{array}
