• ##### Device
• TI-Nspire™ CX
• TI-Nspire™ CX CAS
• TI-Nspire™ Navigator™
• TI-Nspire™
• TI-Nspire™ CAS
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

• ##### TI-Nspire Version

3.2

Middle Grades Math: Definition of Functions
by Texas Instruments - Action Consequence Lesson

Published on August 31, 2011

#### Objectives

• Students will determine the domain and range of relationships given as a set of ordered pairs.
• Students will determine whether or not a relationship is a function or not using the definition.
• Students will verify that relationships are functions or not by examining the relationship graphically and in a table.
• Students will define, evaluate, and compare functions (CCSS).
• Students will reason abstractly and quantitatively (CCSS Mathematical Practice).
• Students will construct viable arguments and critique the reasoning of others (CCSS Mathematical Practice).
• Students will look for and make use of structure (CCSS Mathematical Practice).

#### Vocabulary

• relationship
• input
• output
• domain
• range
• function

This lesson involves examining relationships and functions and their inputs, outputs, domains, and ranges.
As a result, students will:

• Examine a relationship, determine its domain and range, and plot it on a coordinate grid.
• Examine a relationship in table form with arrows to connect inputs with their given outputs.
• Learn that a function is a rule that assigns to each input exactly one output and that the graph of a function is the set of ordered pairs consisting of an input and the corresponding output.
• Students will create their own relationships, one that is a function and one that is not.