Explain how to identify if the graph of a relation is a function or not

[see below]

Step-by-step explanation:

A function is a relation where one domain value is assigned to exactly one range.

An x-value in a function must not repeat.

One way to see if a graph is a function is to use a vertical line test. If the line passes trough the line twice, then it is not a function. On a table, check the x-value column or row. If any of the numbers repeat, then it is not a function. On a mathematical map, check to see if the arrows from a domain number points to one range value on the other side. If it points to two range numbers, then it is not a function.

Hope this helps.