Question

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

Explanation:

Step1: Recall rotation rule

When a point $(x,y)$ is rotated 90° counter - clockwise about the origin, the new coordinates $(x',y')$ are given by the transformation rule $(x,y)\to(-y,x)$.

Answer:

$(x,y)\to(-y,x)$ (the second option)