# This lesson helps students discover the domain and range of practical linear functions (word problems)

Subject:

Math

9

Title – Understanding domain and range values between theoretical and practical linear functions.
By – Daniel Bynum
Primary Subject – Math – Algebra I
Grade Level – 9th

TEKS / TAKS Objectives: 111.32.c.1.B

Lesson Objective:
Understanding the domain and range values for various linear functions.

Anticipatory Set:
Warm-up problems in which the students will determine the domain and range for several linear equations.

Input Procedures:
Read a linear word problem and then determine an equation for that problem (The equation should be the same as the last warm-up problem). Now, discuss with the class what they think the domain and range should be, based on the wording of the problem. How does the domain and range of the warm-up compare to the domain and range of the word problem?

Checking for Understanding:
Class discussion lead by instructor.

Guided Practice:
Several more similar problems on the board. Have various students help with solution.

Independent Practice:
In small groups, the students will continue to solve for the domain and range of various equations and word problems.

Closure:
After guided practice re-explain the difference between domain and range values of theoretical equations and real life word problems.

Assessment:
Done throughout the lesson and especially during independent practice. Help facilitate small group discussions if needed.

Re-teach:
Graphing specific functions to reinforce visual, auditory, and kinesthetic learners.

Enrichment / Extension:
Have students explore linear relationships between two things in their life and determine an equation, the domain, and the range.

Modification(s):