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

Course 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

Course 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

Course Line Graphs Learn to display and analyze data in line graphs.

Course Line Graphs Vocabulary line graph double-line graph

Course 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.

Course 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, , , ,000

Course 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!

Course 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 ,000 2,000 3,000 4,000 5,000 6,000 Population Year Population of New Hampshire

Course Line Graphs Check It Out: Example 1 Use the data in the table to make a line graph. School District Enrollment YearPopulation 19962, , , ,000

Course 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 ,000 2,000 3,000 4,000 5,000 6,000 Number of Students Year School District Enrollment

Course 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

Course 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

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

Course Line Graphs Additional Example 3: Making a Double-Line Graph Use the data in the table to make a double-line graph. Stock Prices 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

Course 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. $ $10 $20 $30 $40 Price of Stock Year Stock Prices Corp. A Corp. B

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

Course 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. $ $10 $20 $30 $40 Price of Stock Year Stock Prices Corp. C Corp. D

Course Line Graphs Lesson Quiz: Part I 1. Use the data to make a line graph. Number of Aluminum Cans Collected MonTueWedThuFri Number of Cans Aluminum Cans Collected M T W Th F

Course 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