Question

Which rule would result in a clockwise rotation of 90° about the origin?

(x, y) → (x, -y)
(x, y) → (x + 4, y + 4)
(x, y) → (y, x)
(x, y) → (4x, 4y)

Answer 1

A : x, y -> x, -y

Could jaut look this up