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Answer:
see attached (black dot)
Explanation:
We assume you want to plot (r, θ) = (-3, -π/3), where the angle is in radians.
The basic idea is to locate the ray that is in the direction -π/3 radians, then go 3 units in the opposite direction. The point (3, -π/3) is identified in the attached graph by a red circle. Its reflection across the origin is how you plot the point for a negative radius. That reflected point is the black dot.
The equivalent coordinates are ...
(r, θ) = (-(-3), -π/3+π) = (3, 2π/3)