First point = (x1, y1) = (-1, 8)
Second point = (x2, y2) = (5, -4)
m = slope
m = (y2 - y1)/(x2 - x1) .... is the slope formula
m = (-4 - 8)/(5 - (-1)) .... plug in the given values
m = (-4 - 8)/(5 + 1)
m = -12/6
m = -2
The slope is -2
Answer: Choice C