What's a Function?

What's a Function?

Note:

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!

Keywords:

  • definition
  • function
  • input
  • output
  • x-value
  • y-value
  • relation
  • domain
  • range
  • ordered pairs
  • graph
  • function rule
  • table
  • mapping diagram
  • operation
  • operations
  • ordered pair

Background Tutorials

  • Function Definitions and Function Notation

      • What is Function Notation?What is Function Notation?

      What is Function Notation?

      Every see 'f(x)' in your math? That's function notation! It's a way to indicate that an equation is a function. Learn about function notation by watching this tutorial.

Further Exploration

  • Function Definitions and Function Notation

      • How Do You Figure Out If a Relation is a Function?How Do You Figure Out If a Relation is a Function?

      How Do You Figure Out If a Relation is a Function?

      How do you figure out if a relation is a function? You could set up the relation as a table of ordered pairs. Then, test to see if each element in the domain is matched with exactly one element in the range. If so, you have a function! Watch this tutorial to see how you can determine if a relation is a function.