1. 6-7 Line Graphs Warm Up Problem of the Day Lesson Presentation
Course 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. Vocabulary
line graph
double-line graph

4. Data that shows change over time is best displayed in a line graph
Data that shows change over time is best displayed in a line graph. A line graph displays a set of data using line segments.

5. Population of New Hampshire
Additional Example 1: Making a Line Graph
Use the data in the table to make a line graph.
Population of New Hampshire
Year
Population
1650
1,300
1670
1,800
1690
4,200
1700
5,000

6. Because time passes whether or not the population changes, time is independent of population. Always put the independent quantity on the horizontal axis.
Caution!

7. Population of New Hampshire
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
Year

8. 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

9. 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

10. Lesson Quiz: Part II
Use the line graph to answer each question.
1. Which plant was taller on Tuesday?
2. Which plant grew more between Thursday and Friday?
3. Which plant grew the most in one week? A
Each grew the same amount. A

11. Number of Aluminum Cans Collected
Lesson Quiz: Part I
4. Use the data to make a line graph.
Number of Aluminum Cans Collected
Mon
Tue
Wed
Thu
Fri
100
150
200
125
175 50
100
150
200
250
Number of Cans
Aluminum Cans Collected
M T W Th F