Warm Up

1
Warm Up
Problem of the Day
Lesson Presentation
2
Warm Up Describe how to graph each point on a
coordinate grid. 1. (4, 5) 2. (0, 2) 3. (3,
0)
right 4, up 5
up 2
right 3
3
Problem of the Day Study the first two columns
to determine a pattern to help fill in the blank
square at the bottom.
4 49 6
11 134 12
7 85
6
4
Learn to display and analyze data in line graphs.
5
Vocabulary
line graph double-line graph
6
Data that shows change over time is best
displayed in a line graph. A line graph displays
a set of data using line segments.
7
Additional Example 1 Making a Line Graph Use the
data in the table to make a line graph.
Population of New Hampshire Population of New Hampshire
Year Population
1650 1,300
1670 1,800
1690 4,200
1700 5,000
8
(No Transcript)
9
Additional Example 1 Continued
Step 1 Place year on the horizontal axis and
population on the vertical axis. Label the axes.
Step 2 Determine an appropriate scale and
interval for each axis.
Population of New Hampshire
Step 3 Mark a point for each data value. Connect
the points with straight lines.
6,000
5,000
4,000
Population
3,000
2,000
Step 4 Title the graph.
1,000
0
1650 1670 1690 1700
Year
10
Check It Out Example 1 Use the data in the table
to make a line graph.
School District Enrollment School District Enrollment
Year Population
1996 2,300
1998 2,800
2000 5,200
2002 6,000
11
Check It Out Example 1 Continued
Step 1 Place year on the horizontal axis and
number of students on the vertical axis. Label
the axes.
Step 2 Determine an appropriate scale and
interval for each axis.
School District Enrollment
6,000
Step 3 Mark a point for each data value. Connect
the points with straight lines.
5,000
4,000
Number of Students
3,000
2,000
1,000
Step 4 Title the graph.
0
1996 1998 2000 2002
Year
12
Additional Example 2 Reading a Line Graph Use
the line graph to answer each question.
A. In which year did CDs cost the most?
2002
B. About how much did CDs cost in 2000?
15
C. Did CD prices increase or decrease from 1999
through 2002?
Increase
13
Check It Out Example 2 Use the line graph to
answer each question.
A. In which year did CDs cost the least?
1999
B. About how much did CDs cost in 1999?
13
C. Did CD prices increase or decrease from 2001
to 2002?
Increase
14
Line graphs that display two sets of data are
called double-line graphs.
15
Additional Example 3 Making a Double-Line
Graph Use the data in the table to make a
double-line graph.
Stock Prices Stock Prices Stock Prices Stock Prices Stock Prices
1985 1990 1995 2000
Corporation A 16 20 34 33
Corporation B 38 35 31 21
16
Additional Example 3 Continued
Step 1 Determine an appropriate scale and
interval.
Step 2 Mark a point for each Corporation A value
and connect the points.
Step 3 Mark a point for each Corporation B value
and connect the points.
Stock Prices
Price of Stock
Step 4 Title the graph and label both axes.
Include a key.
Year
17
Check It Out Example 3 Use the data in the table
to make a double-line graph.
Stock Prices Stock Prices Stock Prices Stock Prices Stock Prices
1985 1990 1995 2000
Corporation C 8 16 20 28
Corporation D 35 22 14 7
18
Check It Out Example 3 Continued
Step 1 Determine an appropriate scale and
interval.
Step 2 Mark a point for each Corporation C value
and connect the points.
Step 3 Mark a point for each Corporation D value
and connect the points.
Stock Prices
Price of Stock
Step 4 Title the graph and label both axes.
Include a key.
Year
19
Lesson Quiz Part I
1. Use the data to make a line graph.
Number of Aluminum Cans Collected Number of Aluminum Cans Collected Number of Aluminum Cans Collected Number of Aluminum Cans Collected Number of Aluminum Cans Collected
Mon Tue Wed Thu Fri
100 150 200 125 175
20
Lesson Quiz Part II
Use the line graph to answer each question. 2.
Which plant was taller on Tuesday? 3. Which
plant grew more between Thursday and Friday? 4.
Which plant grew the most in one week?
A
Each grew the same amount.
A