Question

Which of the following relations is a function?

Answer 1

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.