Rotate a point 90 or 180 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 180° about the origin to the point (1, −8). What are the coordinates of the image?
2. Apply a rotation 180° about the origin to the point (3, 6). What are the coordinates of the image?
3. Apply a rotation 90° clockwise about the origin to the point (1, 7). What are the coordinates of the image?
4. Apply a rotation 90° counterclockwise about the origin to the point (−8, −7). What are the coordinates of the image?
5. Apply a rotation 90° counterclockwise about the origin to the point (−2, −6). What are the coordinates of the image?
6. Apply a rotation 180° about the origin to the point (1, −4). What are the coordinates of the image?
7. Apply a rotation 90° clockwise about the origin to the point (−6, −5). What are the coordinates of the image?
8. Apply a rotation 180° about the origin to the point (−10, 2). What are the coordinates of the image?
9. Apply a rotation 90° clockwise about the origin to the point (−2, −12). What are the coordinates of the image?
10. Apply a rotation 90° clockwise about the origin to the point (−11, −3). What are the coordinates of the image?
11. Apply a rotation 90° clockwise about the origin to the point (−10, 6). What are the coordinates of the image?
12. Apply a rotation 90° clockwise about the origin to the point (5, −6). What are the coordinates of the image?
13. Apply a rotation 90° counterclockwise about the origin to the point (14, 5). What are the coordinates of the image?
14. Apply a rotation 90° counterclockwise about the origin to the point (−3, −4). What are the coordinates of the image?
15. Apply a rotation 90° clockwise about the origin to the point (−2, 6). What are the coordinates of the image?
16. Apply a rotation 90° counterclockwise about the origin to the point (−7, 2). What are the coordinates of the image?
17. Apply a rotation 180° about the origin to the point (20, 13). What are the coordinates of the image?
18. Apply a rotation 180° about the origin to the point (−14, −1). What are the coordinates of the image?
19. Apply a rotation 180° about the origin to the point (8, −7). What are the coordinates of the image?
20. Apply a rotation 90° clockwise about the origin to the point (14, 1). What are the coordinates of the image?