How do we graph Rotations?

1. Know the angle of rotation.
2. Know the direction (either it is clockwise or counterclockwise)
3. Use the formula of the given angle to each point.

90 degree rotation
(x,y) → (-y,x)

-90 degree rotation
(x,y) → (-y,x)

180 degree rotation
(x,y) → (-x,-y)

270 degree rotation
(x,y) → (y,-x)