Given two points (a,b) and (c,d), the slope of the line that passes through both is given by the quotient between the difference of their y-values and the difference of their x-values:
[tex]m=\frac{d-b}{c-a}[/tex]
Then for the points (6,5) and (8,-5) we get:
[tex]m=\frac{-5-5}{8-6}=-\frac{10}{2}=-5[/tex]
Then the answer is option A and the slope is m=-5.
