does each relation reprsent a fuction? choose yes or no
1.(1,3), (2,5), (2,7), (4,9) yes or no
2.(1,3), (2,5), (3,7), (4,9) yes or no
3.(1,3), (1,5), (1,7), (1,9) yes or no
4.(1,3), (2,3), (3,3), (4,3) yes or no