Question

Which relation is a function?

Question 3 options:

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

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

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

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

Answer 1

The correct answer would be C.

Explanation:

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

A function doesn't let its x-coordinates repeat. In the first option, 2 repeats. In the second option, 1 repeats. In the 4th option, 1 repeats.

Hope this helps! :)