Answer:
2/3
Explanation:
For a conic equation of the form ...
r = ed/(1+e·sin(θ))
the eccentricity is represented by e and the distance from the pole to the directrix is represented by d.
Your equation can be rewritten in this form as ...
r = 3·(-2/3)/(1 +3·sin(θ))
This means the directrix is 2/3 units below the pole.