Answer
$m=0$
Work Step by Step
Using $m=\dfrac{y_1-y_2}{x_1-x2}$ the slope of the line determined by the given points, $(
3,-4
) \text{ and } (
2,-4
),$ is
\begin{array}{l}\require{cancel}
m=\dfrac{-4-(-4)}{3-2}
\\\\
m=\dfrac{-4+4}{1}
\\\\
m=\dfrac{0}{1}
\\\\
m=0
.\end{array}