Respuesta :

Given:

A set of ordered pairs.

Required: Check whether each is a function.

Explanation:

A function is a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output.

3. The input -13 has 2 output values 4 and 9. Hence it is not a function.

4. Each input has exactly one output. There fore, it is a function.

Final Answer:

3. Not a function