Question

Which ordered pair gives the coordinates of the image of R(-a, b) if R is rotated clockwise 180°?

( a, b)
( b, - a)
(- b, - a)
( a, - b)

Answer 1

Rotation by 180° sends (x,y) to (-x,-y). Applying that to R(-a,b) gives -(-a)=a and -b=-b, so the image is (a, -b).