This handout is for the introductory lesson of Gr. 11 Functions, where students will learn to differentiate between relations and functions. We explore how students can determine if something is a function graphically, through ordered pairs, and algebraically. Ontario Curriculum Expectations:A1.1 - explain the meaning of the term function, and distinguish a function from a relation that is not a function, through investigation of linear and quadratic relations using a variety of representations