# Lesson Plan: Relations and Functions Mathematics • 8th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to identify, represent, and recognize functions from schematic descriptions, arrow diagrams, and graphs.

#### Objectives

Students will be able to

• define a function,
• determine whether a relation is a function from a relation diagram, a table, and a set of ordered pairs,
• determine whether a relation is a function from its schematic descriptions or equation,
• determine equations that can be defined as functions,
• represent functions using diagrams, sets of ordered pairs, equations, and graphs,
• define and find a domain, a codomain, and a range of discrete functions (as sets),
• find unknowns given that a relation between two sets is a function.

#### Prerequisites

Students should already be familiar with

• sets and set notation,
• Cartesian products,
• representing relations.

#### Exclusions

Students will not cover

• polynomial functions,
• continuous functions.