How to rotate (-4,4) clockwise 90 degrees about (1,1)

Draw a new coordinate system on the point (1,1) so that (1 , 1) is the new origin.

Find the new coordinate for the point (-4,4) which is (-5 , 3)

Rotate 90 degrees clockwise, you obtain the point (3,5) at the new coordinates.

Find the old coordinate for the point (3,5) which is (4,6)

DONE!!