Answer :
Hey!
------------------------------------------------
Formula: [tex]m = \frac{y2 - y1}{x2 - x1}[/tex]
------------------------------------------------
Steps To Solve:
~Substitute
[tex]m = \frac{-1 - 7}{4 - (-1)}[/tex]
~Simplify
[tex]m = \frac{-8}{5}[/tex]
------------------------------------------------
Answer:
[tex]\large\boxed{C)~\frac{-8}{5} }[/tex]
------------------------------------------------
Hope This Helped! Good Luck!