Answer
$m=\text{undefined}$
Work Step by Step
With the given points,
\begin{array}{l}\require{cancel}
y_1=
7.5
,\\y_2=
-3.2
,\\x_1=
6.8
,\text{ and }\\ x_2=
6.8
.\end{array}
Using $m=\dfrac{y_1-y_2}{x_1-x_2}$ or the Slope Formula, the slope, $m,$ of the line is
\begin{array}{l}\require{cancel}
m=\dfrac{7.5-(-3.2)}{6.8-6.8}
\\\\
m=\dfrac{7.5+3.2}{6.8-6.8}
\\\\
m=\dfrac{10.7}{0}
\\\\
m=\text{undefined}
.\end{array}
