Question

Which of the sets of ordered pairs represents a function

A = {(-4,5), (1, -1), (2, -2), (2, 3)}
B = {(2, 2), (3, -2), (9, 3), (9, -3)}
Answers
1. Only A
2. Only B
3. Both of them
4. Neither of them

Answer 1

4. because it is just numbers with no functions

Answer 2

4 neither of them are functions because the x repeats itself