What are the seasons are created by a combination of

Tilt

Explanation:

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-cicular path around the sun).

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)