Title: Lesson 8-1
Author: mark_cameron
Last saved by: gtsmith
Company: McGraw-Hill

Lesson 2-9

Example 1 Use Integers to Represent Data
Write an integer to represent the data.
Abigail received an increase of $9 in her weekly salary.

The word increase represents a positive number. The integer is +9 or 9.

Example 2 Use Integers to Represent Data
Write an integer to represent the data.
The temperature was 4 degrees below zero yesterday.

The word below here means less than. The integer is –4.

Example 3 Graph an Integer on a Number Line

Draw a number line. Then draw a dot at the location that represents –5.

Graph –5 on a number line.

Example 4 Real-World Example

Weight Change of 
Football Players (lb)

−2 | +4 | 0 | −5 | −8
0 | −8 | −3 | 0 | +1
−9 | +1 | −5 | +3 | −5
−8 | −5 | +4 | −6 | −3
FOOTBALL The table shows the number of pounds lost or gained by football players after the first two weeks of practice. Make a line plot of the data.

Draw a number line. −9 would be plotted 
farthest to the left and +4 farthest to the right. So you can use a scale of −10 to 5. 
Put an x above the number that represents each loss or gain of weight in the table.

−10

−5

0

5

Weight Change of Football Players (lb)

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