Question

Plz help I will fan and medal



Which relation is a function?

{(1, 2); (2, 2); (3, 2); (4, 2)}

{(1, 2); (1, 3); (1, 4); (1, 5)}

{(1, 2); (2, 3); (3, 4); (1, 5)}

{(1, 2); (2, 3); (3, 4); (2, 5)}

Answer 1

In a function.... for each x there is one and one one y.

Answer 2

@Lelemarie2001 which one do you think it is and why?