Which of the following relations is a function? OA.
{(3,-1), (2, 3), (3, 4), (1,7)}
OB.
{(1, 2), (1,3), (2,8), (3,9)}
O c.
{(3, 0), (4,-3), (6, 7), (4,4)}
OD
{(1, 2), (2, 3), (3, 4), (4, 5)}

Answer & Step-by-step explanation:

The definition of a function is that every input, x, must have only one output, y. So, for every x value, there should be only one y value with it. If you have two x values that are the same and have different y values, then that is not a function. The only answer that showcases this is letter D.

1 → 2

2 → 3

3 → 4

4 → 5

In this function, every input has one output and each x value is different.