Answer :
the answer is a.2 because this coordinate is the only one along the slope
[tex]slope=\frac{y_2-y_1}{x_2-x_1}\\\\
(x_1,y_1)=(-1,3)\\
(x_2,y_2)=(4,-7)\\\\
slope=\frac{-7-3}{4+1}=\frac{-10}{5}=-2\\\\
Slope\ is\ equal\ to\ -2.\\Answer\ is\ D.
[/tex]