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# How Do You Tell If a Relation Is a Function?

In math, it can be determined if a relation is a function through the vertical line test. This test must be performed on a function that has been graphed.

Continue ReadingOnce a relation has been graphed, the vertical line test can be used to determine if the relation is a true function. To perform the vertical line test, take a pencil or pen and lie it vertically at the start of the graph. Next, move this vertically positioned pencil in a horizontal line from the beginning of the graph to the end. If the pencil only ever touches one point on the graph at one time, then the relation is a function. This test works because a function is a relation in which every x-point only has one y-point.

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## How Do You Determine If a Relation Is a Function?

A: Determine if a relation is a function by analyzing its ordered pairs, solving for y, or using the vertical line test. The best method depends on whether th... Full Answer >Filed Under: -
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## What Are Examples of Functions in Algebra 2?

A: In Algebra 2, a function is a relation where every input has only one output. A relation is defined as a combination of inputs and outputs Full Answer >Filed Under: -
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## How Do You Figure Out If a Relation Is a Function?

A: One can determine if a relation is a function by graphing the relation, drawing a vertical line on the graph and then checking whether the line crosses the... Full Answer >Filed Under: -
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## What Is the Difference Between a Function and a Relation?

A: A relation is a set of numbers that have a relationship through the use of a domain and a range, while a function is a relation that has a specific set of ... Full Answer >Filed Under: