The slope fof the line is m = -5/4
What is the slope?
Remember that if a line passes through two points (x₁, y₁) and (x₂, y₂) the slope is:
a = (y₂ - y₁)/(x₂ - x₁)
On the given line we can see that:
X = (-8 ,9)
Z = (4, -6)
Then the slope of this line is:
m = (-6 - 9)/(4 + 8)
m = -15/12
m = -5/4