Question

a triangle is rotated 90° about the origin. which rule describes the transformation? (x, y)→(y, -x) (x, y)→(-y, -x) (x, y)→(-x, -y) (x, y)→(-y, x)

Explanation:

Step1: Recall rotation rule

For a 90 - degree counter - clockwise rotation about the origin, the transformation rule for a point $(x,y)$ is $(x,y)\to(-y,x)$.

Answer:

$(x,y)\to(-y,x)$