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

2. Course 1 6-7 Line Graphs 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. Course 1 6-7 Line Graphs Problem of the Day Study the first two columns to determine a pattern to help fill in the blank square at the bottom. 6 4496 1113412 785

4. Course 1 6-7 Line Graphs Learn to display and analyze data in line graphs.

5. Course 1 6-7 Line Graphs Vocabulary line graph double-line graph

6. Course 1 6-7 Line Graphs 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. Course 1 6-7 Line Graphs Additional Example 1: Making a Line Graph Use the data in the table to make a line graph. Population of New Hampshire YearPopulation 16501,300 16701,800 16904,200 17005,000

8. Course 1 6-7 Line Graphs Because time passes whether or not the population changes, time is independent of population. Always put the independent quantity on the horizontal axis. Caution!

9. Course 1 6-7 Line Graphs 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. Step 3: Mark a point for each data value. Connect the points with straight lines. Step 4: Title the graph. 0 1650 1670 1690 1700 1,000 2,000 3,000 4,000 5,000 6,000 Population Year Population of New Hampshire

10. Course 1 6-7 Line Graphs Check It Out: Example 1 Use the data in the table to make a line graph. School District Enrollment YearPopulation 19962,300 19982,800 20005,200 20026,000

11. Course 1 6-7 Line Graphs 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. Step 3: Mark a point for each data value. Connect the points with straight lines. Step 4: Title the graph. 0 1996 1998 2000 2002 1,000 2,000 3,000 4,000 5,000 6,000 Number of Students Year School District Enrollment

12. Course 1 6-7 Line Graphs 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. Course 1 6-7 Line Graphs 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. Course 1 6-7 Line Graphs Line graphs that display two sets of data are called double-line graphs.

15. Course 1 6-7 Line Graphs Additional Example 3: Making a Double-Line Graph Use the data in the table to make a double-line graph. Stock Prices 1985199019952000 Corporation A$16$20$34$33 Corporation B$38$35$31$21 Use different colors of lines to connect the stock values so you will easily be able to tell the data apart. Helpful Hint

16. Course 1 6-7 Line Graphs 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. Step 4: Title the graph and label both axes. Include a key. $0 1985 1990 1995 2000 $10 $20 $30 $40 Price of Stock Year Stock Prices Corp. A Corp. B

17. Course 1 6-7 Line Graphs Check It Out: Example 3 Use the data in the table to make a double-line graph. Stock Prices 1985199019952000 Corporation C$8$16$20$28 Corporation D$35$22$14$7

18. Course 1 6-7 Line Graphs 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. Step 4: Title the graph and label both axes. Include a key. $0 1985 1990 1995 2000 $10 $20 $30 $40 Price of Stock Year Stock Prices Corp. C Corp. D

19. Course 1 6-7 Line Graphs Lesson Quiz: Part I 1. Use the data to make a line graph. Number of Aluminum Cans Collected MonTueWedThuFri 100150200125175 0 50 100 150 200 250 Number of Cans Aluminum Cans Collected M T W Th F

20. Course 1 6-7 Line Graphs 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? Each grew the same amount. A A