Question

Which table represents a function?

Answer 1

Explanation

A function is a set of relation without repetitive domain. That means we cannot have the same value of x in a set.

Example

{(1,1),(1,2),(2,4),(3,9)}

This is not a function because the relation has same two x = 1 which does not make it a function.

{(1,1),(2,4),(3,9)}

This is a function because there are no same x-values or repetitive domain in a single set.

Back to the question, we can find which table represent a function by looking at the x-value table. If there are two same or more x-values, it is not a function.

Answer

The answer is the left bottom table as the other table have two same x-values.