If P=(2,-1), find the image of P under the following rotation. 90 counter about the origin. Enter the number that belongs in the green box.

Step-by-step explanation:

If the image move 90⁰ counterclockwise then it will become (-2, -1).

(1, 2 )

Step-by-step explanation:

Under a counterclockwise rotation about the origin of 90°

a point (x, y ) → (- y, x ) , then

P (2, - 1 ) → (1, 2 )

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this cant be answered without the graph. you may need to add it.