Question

Which relation is a function?

{(–4, –6), (–3, –2), (1, –2), (1, 0)}
{(8, 1), (4, 1), (0, 1), (–15, 1)}
{(0, 1), (0, 2), (1, 2), (1, 3)}
{(–2, –12), (–2, 0), (–2, 4), (–2, 11)}

Answer 1

It’s the 1 first one is the first line

Answer 2

{(8, 1), (4, 1), (0, 1), (-15, 1)} is the function

Explanation:

A function cannot have the same numbers in the x column, (or the first column). They all have to be different numbers. But for the y column, (or the second column) it doesnt matter if the numbers are the same or not.