Which set of ordered pairs represents a function? What are functions?

Given:
The sets of ordered pairs are given.
To find:
The set of ordered pairs represents a function.
Explanation:
As we know,
The function is a relationship between inputs where each input is related to exactly one output.
That means,
No two different ordered pairs have the same x -coordinate.
Therefore, the set of ordered pairs represents a function is,
[tex]\lbrace(6,0),(5,0),(4,0)\rbrace[/tex]Final answer:
The correct option is (2).