Answer:
We have to find slope =m
[tex]{\boxed{\sf Slope_{(m)}=\dfrac {y _2-y_1}{x_2-x_1}}}[/tex]
[tex]\qquad {:}\longrightarrow\sf m=\dfrac {(-3-1)}{(-3-9)}[/tex]
[tex]\qquad {:}\longrightarrow\sf m=\dfrac {-4}{-12}[/tex]
[tex]\qquad {:}\longrightarrow\sf m={\dfrac {1}{3}}[/tex]
[tex]\therefore\sf Slope\;of\;the\:line=\dfrac {1}{3}(undefined)[/tex]