What is the image of the point (-5,-9)(−5,−9) after a rotation of 90^{\circ}90 ∘ counterclockwise about the origin?

Question

What is the image of the point (-5,-9)(−5,−9) after a rotation of 90^{\circ}90  ∘   counterclockwise about the origin?

Raymond B. · Accepted Answer

(-5,-9) rotated counterclockwise becomes (9,-5)(x,y) becomes  (-y,x)

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