Answer :
The formula for the slope between two points (x_1,y_1) and (x_2,y_2) is,
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]Determine the slope between points (1,-4) and (-3,8).
[tex]\begin{gathered} m=\frac{8-(-4)}{-3-1} \\ =\frac{12}{-4} \\ =-3 \end{gathered}[/tex]So answer is -3.