We have two points in polar coordinates:
P1 = (-6, π)
P2 = (3, -5π/3)
The first coordinate represents the length of the line joining the origin and the point, and its sign determines the direction of the line. For the second coordinate, we have the angle between the line and the horizontal line of the coordinate system.
For the first point, we have a length of 6, a negative direction, and an angle of π. The angle of π means "half a revolution", so initially, the point is on the left side, but the sign of the first coordinate is negative, so the direction is the opposite (to the right). The first point is located 6 steps to the right of the origin. For the second point, we have a length of 3, a positive direction, and an angle of -5π/3. The negative sign of the angle means "clockwise", so the second point is located 3 steps away from the origin, and for an angle of 5π/3 below the horizontal line. Graphically, this is: