Question

Rotate P(2, -9) 90° counterclockwise about the origin and identify P'

Answer 1

P' (9 , 2)

Explanation:

(x , y) -> (-y , x)

P (2 , -9) -> P' (9 , 2)

Answer 2

(9,2)

90 counterclockwise rotation = (x,y) ==> (-y,x)

Hope that helps!