To be able to determine which set of pairs does not describe a function, that set of pairs mustn't have a complete set of totally unique pairs which a function should have.
Let's check.
1.) (- 1, 1), (0, 0), (0, 1), (1, 1), (1, 2)
- This set of pairs don't have a unique set of pairs. This does not describe a function.
2.) (1, 3) , (2, 6) , (3, 9), (4, 12), (5, 15)
- This set of pair have a unique set of pairs. This does describe a function.
3.) (- 1, 1), (0, 0), (1, 1), (2, 4), (3, 9)
- Not all of its sets of pairs are unique. This does not describe a function.
4.) 1, 2), (2, 3), (3, 4), (4, 5) , (5, 6)
- This set of pair have a unique set of pairs. This does describe a function.
Therefore, the answer is 1 and 3.