Answer:
Take your pick, or make your own, there's an infinite number of ways.
Step-by-step explanation:
Rotate CCW 90° about (0, 0) (x, y) → (-y, x)
Shift 2 units right (x, y) → (x + 2, y)
or possibly the simplest
rotate CCW 90° about (1, 1) (x, y) → (xc - (y - yc) , yc + (x - xc)
where (xc, yc) = (1, 1) (x, y) → (1 - (y - 1) , 1 + (x - 1)
(x, y) → (2 - y , x)
