Question

question
what is the image of the point (4, 5) after a rotation of 90° counterclockwise about the origin?
answer
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Explanation:

Step1: Recall 90° CCW rotation rule

For a point $(x,y)$, rotation gives $(-y,x)$

Step2: Substitute $x=4,y=5$

$(-5, 4)$

Answer:

$(-5, 4)$