Which axis was the point reflected in?

Compare the coordinates before and after. If y changed sign it is the x-axis. If x changed sign it is the y-axis.

1. A point moves from (4, −8) to (−4, −8). It was reflected in one of the axes. Write x-axis or y-axis.
2. A point moves from (−6, −1) to (−6, 1). It was reflected in one of the axes. Write x-axis or y-axis.
3. A point moves from (−7, 1) to (7, 1). It was reflected in one of the axes. Write x-axis or y-axis.
4. A point moves from (5, −1) to (−5, −1). It was reflected in one of the axes. Write x-axis or y-axis.
5. A point moves from (−7, 9) to (−7, −9). It was reflected in one of the axes. Write x-axis or y-axis.
6. A point moves from (9, 10) to (9, −10). It was reflected in one of the axes. Write x-axis or y-axis.
7. A point moves from (−9, −4) to (−9, 4). It was reflected in one of the axes. Write x-axis or y-axis.
8. A point moves from (4, −9) to (−4, −9). It was reflected in one of the axes. Write x-axis or y-axis.
9. A point moves from (−8, −9) to (−8, 9). It was reflected in one of the axes. Write x-axis or y-axis.
10. A point moves from (−8, −6) to (8, −6). It was reflected in one of the axes. Write x-axis or y-axis.
11. A point moves from (−10, 12) to (−10, −12). It was reflected in one of the axes. Write x-axis or y-axis.
12. A point moves from (9, 4) to (−9, 4). It was reflected in one of the axes. Write x-axis or y-axis.
13. A point moves from (12, −10) to (12, 10). It was reflected in one of the axes. Write x-axis or y-axis.
14. A point moves from (15, −1) to (15, 1). It was reflected in one of the axes. Write x-axis or y-axis.
15. A point moves from (10, −8) to (10, 8). It was reflected in one of the axes. Write x-axis or y-axis.
16. A point moves from (−7, 8) to (7, 8). It was reflected in one of the axes. Write x-axis or y-axis.
17. A point moves from (−6, 4) to (6, 4). It was reflected in one of the axes. Write x-axis or y-axis.
18. A point moves from (−14, −13) to (−14, 13). It was reflected in one of the axes. Write x-axis or y-axis.
19. A point moves from (14, −8) to (14, 8). It was reflected in one of the axes. Write x-axis or y-axis.
20. A point moves from (−20, 20) to (20, 20). It was reflected in one of the axes. Write x-axis or y-axis.