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More Lessons for Grade 9, Math Worksheets

Videos, worksheets, solutions, and activities to help Algebra 1 students learn how to distinguish between relations and functions and how to to solve real life problems that deal with relations.

**What is a relation?**

A relation is any set of ordered pairs.

**What is a function?**

1. A function is a relation in which each x-element has only one y-element associated with it. Given a set of ordered pairs, a relation is a function if there are no repeated x-value.

2. A relation is a function if there are no vertical lines that intersect its graph at more than one point. This is called the vertical line test.

Relations & Functions

This video looks at relations and functions. It includes six examples of determining whether a relation is a function, using the vertical line test and by looking for repeated x values.
Relations

Learn about relations

Relations - Applications

Learn to solve real life problems that deal with relations
Functions

Learn about functions

Write Functions

Learn how do we write functions as rule

You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

More Lessons for Grade 9, Math Worksheets

Videos, worksheets, solutions, and activities to help Algebra 1 students learn how to distinguish between relations and functions and how to to solve real life problems that deal with relations.

A relation is any set of ordered pairs.

1. A function is a relation in which each x-element has only one y-element associated with it. Given a set of ordered pairs, a relation is a function if there are no repeated x-value.

2. A relation is a function if there are no vertical lines that intersect its graph at more than one point. This is called the vertical line test.

Relations & Functions

This video looks at relations and functions. It includes six examples of determining whether a relation is a function, using the vertical line test and by looking for repeated x values.

Learn about relations

Learn to solve real life problems that deal with relations

Learn about functions

Learn how do we write functions as rule

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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