Title: Lesson 3-1
Author: mark_cameron
Last saved by: MHE
Company: McGraw-Hill

Lesson 2-1

Example 1  Write Integers for Real-Life Situations
WEATHER   Write an integer for the following situation.  The average rainfall in Dallas for June was 3 inches above normal.

Because it represents above normal, the integer is +3 or 3.

Example 2  Write Integers for Real-Life Situations
WEATHER   Write an integer for the following situation.  The average temperature in Washington, D. C. for May was 7 degrees below normal.

Because it represents below normal, the integer is –7.

Example 3  Graph Integers
Graph the set of integers {3, -2, 0} on a number line.

Draw a number line. Then draw a dot at the location for each integer. 

Example 4  Evaluate Expressions
Evaluate | -6|.

On the number line, the graph of –6 is 6 units from 0.	
So,  = 6.

Example 5  Evaluate Expressions
Evaluate |-8| - |-5|. 

 = 8 – 5	 = 8,  = 5
                 = 3		Subtract.