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6-7

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

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6-7

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

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

  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.

  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. Helpful Hint Use different colors of lines to connect the stock values so you will easily be able to tell the data apart. Additional Example 3: Making a Double-Line Graph Use the data in the table to make a double-line graph.

  16. Corp. A Corp. B $40 $30 $20 $10 $0 1985 1990 1995 2000 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.

  18. Corp. C Corp. D $40 $30 $20 $10 $0 1985 1990 1995 2000 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. Aluminum Cans Collected 250 200 Number of Cans 150 100 50 0 M T W Th F Lesson Quiz: Part I 1. Use the data to make a line graph.

  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

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