Question

Which set of ordered pairs is a function?

{(-2,1),(-4, 2), (0, 3), (4,1),(-2,5)}
{(-1,5), (-1,4) (-1,3), (-1, 2), (-1,1)}
{(-6,-4), (-4,-2), (0,0).(-4, 2).(-6,4)}
{(-5,1). (-3, 2), (-1,3), (1,4), (3,5)}

Answer 1

probbly {(-5,1). (-3, 2), (-1,3), (1,4), (3,5)}

Explanation:

Answer 2

The last one is the function because the x value should never repeat itself and the last one or D. shows a function.