# Functions

### Popular Tutorials in Functions

• #### How Can You Tell if a Relation is Not a Function?

Every function is a relation, but not every relation is a function! Watch this video to learn how to tell which relations are functions and which are not.

• #### What is Domain?

Did you know that a relation has a domain? The domain of a relation is the set of the first coordinates from the ordered pairs. This tutorial defines the domain of a relation!

• #### What's the Inverse of a Relation?

Did you know there's something called the inverse of a relation? Watch this tutorial to learn the definition for the inverse of a relation and to see an example!

• #### What's a Function?

You can't go through algebra without learning about functions. This tutorial shows you a great approach to thinking about functions! Learn the definition of a function and see the different ways functions can be represented. Take a look!

• #### How Do You Translate a Function?

Think about sliding a penny on a table. All you're doing is moving the penny to a new location on the table. That's basically all that's happening when you translate a function! When you translate a function, you're just sliding it to a new location on the coordinate plane!

• #### How Do You Find the Sum of Two Functions?

Adding functions is easier than you might think! Follow along with this tutorial to learn how to add two functions together.

• #### How Do You Find the Inverse of a Linear Function?

The steps for finding the inverse of a linear function are a lot like those for solving a linear equation. In both cases you need to isolate a variable in an equation. Watch this tutorial to learn more about finding inverses of linear functions!

• #### What are Compositions of Functions?

A composition of two functions uses the output of one function as the input of the other. Watch this tutorial to learn more about function composition!