Oswego City School District
Regents Exam Prep Center: Relation Machine
A downloadable worksheet that allows learners to practice solving equations by using the "relation machine." Solve for y and determine if the relation is a function for the x value.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Relation
Find a quick, concise explanation of a relation. Examples are given and clearly explained.
Oswego City School District
Regents Exam Prep Center: Definition of a Relation and a Function
Very basic definitions of mathematical relations and functions can be found here. The single example provided shows a relation which is not a function and explains what makes it so.