14.下表分别给出了变量x与y之间的对应关系,判断y是x的函数吗?如果不是,请你说明理由.
(1)
(2)
(3)
(4)
0 287489 287497 287503 287507 287513 287515 287519 287525 287527 287533 287539 287543 287545 287549 287555 287557 287563 287567 287569 287573 287575 287579 287581 287583 287584 287585 287587 287588 287589 287591 287593 287597 287599 287603 287605 287609 287615 287617 287623 287627 287629 287633 287639 287645 287647 287653 287657 287659 287665 287669 287675 287683 366461
(1)
| x | 1 | 2 | 3 | 4 | 5 |
| y | 3 | 6 | 9 | 12 | 15 |
| x | 1 | 2 | 3 | 4 | 5 |
| y | 2 | 5 | 8 | 11 | 14 |
| x | 1 | 2 | 3 | -2 | -1 |
| y | 2 | 5 | 10 | -5 | -2 |
| x | 1 | 2 | 3 | 2 | 1 |
| y | 11 | 10 | 9 | 8 | 7 |