Rotate a point 90 degrees about the origin

A 180° turn changes both signs. A 90° counterclockwise turn sends (x, y) to (−y, x). A 90° clockwise turn sends (x, y) to (y, −x).

1. Apply a rotation 90° clockwise about the origin to the point (−2, −3). What are the coordinates of the image?
2. Apply a rotation 90° counterclockwise about the origin to the point (−7, −3). What are the coordinates of the image?
3. Apply a rotation 90° clockwise about the origin to the point (1, −4). What are the coordinates of the image?
4. Apply a rotation 90° counterclockwise about the origin to the point (5, 5). What are the coordinates of the image?
5. Apply a rotation 90° clockwise about the origin to the point (−1, −4). What are the coordinates of the image?
6. Apply a rotation 90° counterclockwise about the origin to the point (6, −4). What are the coordinates of the image?
7. Apply a rotation 90° counterclockwise about the origin to the point (−6, −7). What are the coordinates of the image?
8. Apply a rotation 90° counterclockwise about the origin to the point (−2, −7). What are the coordinates of the image?
9. Apply a rotation 90° counterclockwise about the origin to the point (−11, −5). What are the coordinates of the image?
10. Apply a rotation 90° clockwise about the origin to the point (−4, 10). What are the coordinates of the image?
11. Apply a rotation 90° counterclockwise about the origin to the point (−5, 12). What are the coordinates of the image?
12. Apply a rotation 90° counterclockwise about the origin to the point (−8, 10). What are the coordinates of the image?
13. Apply a rotation 90° counterclockwise about the origin to the point (−6, 12). What are the coordinates of the image?
14. Apply a rotation 90° clockwise about the origin to the point (−8, −11). What are the coordinates of the image?
15. Apply a rotation 90° counterclockwise about the origin to the point (8, 5). What are the coordinates of the image?
16. Apply a rotation 90° clockwise about the origin to the point (−12, −1). What are the coordinates of the image?
17. Apply a rotation 90° clockwise about the origin to the point (−18, 18). What are the coordinates of the image?
18. Apply a rotation 90° counterclockwise about the origin to the point (11, −14). What are the coordinates of the image?
19. Apply a rotation 90° counterclockwise about the origin to the point (−9, 1). What are the coordinates of the image?
20. Apply a rotation 90° counterclockwise about the origin to the point (−4, 13). What are the coordinates of the image?