From the image
[tex]\begin{gathered} y_2=7 \\ y_1=-8 \\ x_1=2 \\ x_2=-1 \end{gathered}[/tex][tex]\begin{gathered} \text{The slope is given as } \\ m\text{ = }\frac{y_2-y_1}{x_2-x_1} \\ m\text{ = }\frac{7-(-8)}{-1-2} \end{gathered}[/tex][tex]m\text{ =}\frac{15}{-3}=\text{ -5}[/tex]
