Point-slope form is : y-y₁=m(x-x₁)
The points given are : (8, -4)
Slope given : -5/6
So, simply plug in the values.
Remember, m = slope
y - y₁ = m(x - x₁)
y - (-4) = -5/6(x - 8)
Simplify.
y + 4 = -5/6(x - 8)
So, your answer is the THIRD choice.
~Hope I helped!~