The expression for the slope of line passing through two points are :
[tex]\text{ Slope=}\frac{y_2-y_1}{x_2-x_1}[/tex]In the given question:
Two points are : (6,9) & ( 7,1)
[tex]\begin{gathered} (x_1,y_1)=(6,9) \\ (x_2,y_2)=(7,1) \\ \text{ Slope=}\frac{y_2-y_1}{x_2-x_1} \\ \text{Slope = }\frac{1-9}{7-6} \\ \text{Slope}=\frac{-8}{1} \\ \text{ Slope = (-8)} \end{gathered}[/tex]Slope = (-8)
Answer : A) - 8
