​ What is a relation?

From Google:

Relation: A relation is simply a set of ordered pairs. The first elements in the ordered pairs (the x-values), form the domain. The second elements in the ordered pairs (the y-values), form the range.

 

Videos to help! :)

 

Purplemath

http://www.purplemath.com/modules/fcns.htm

 

Khan Academy

https://www.khanacademy.org/math/algebra2/functions-and-graphs/function-introduction/v/relations-and-functions