Question

A point at (6, -4) is rotated 270 degrees about the origin, where will it be located at after the rotation?

Answer 1

Rotate 270° counterclockwise: (x,y) -> (y, -x). So (6, -4) -> (-4, -6).

(If you meant 270° clockwise = 90° counterclockwise, the image would be (4, 6).)