How would I go about sketching the polar point (-3, π/3).?

Answer 1

this is of the form (r, theta). plot the point by plotting an angle theta, π/3 for you, and using an r (distance from the origin) of -3.

If you want the rectangular coordinates, use
x = r*cos (theta)
y = r* sin(theta)

Answer 2

The polar point (-3, π/3) is the same as the point (3, 4π/3).