Geometry

(-x, y)

(-x, y)

Over y-axis

(x, -y)

Over x-axis

(-x, -y)

Through origin

(y, x)

Over y = x

(-y, -x)

Over y = -x

(-y, x)

90 degrees about the origin

(-x, -y)

180 degrees about the origin

(y, -x)

270 degrees about the origin