By
Harleen Suri, Eliza Neights, Carina Tse
What is a Line Graph?
 Graph used to represent data with an independent and
dependent variable when showing changes over time
 Data is plotted on the graph and connected with lines
When is it Used?
 When you are showing changes over time
Real World Example
 The graph shows the temperature (°F) of New York
City over 6 days
 Can easily see trend of data
 Could be used by meteorologists
What Type of Data Do You Need?
 Set of data- Can be a single or multiple or single
set
 Need key if using multiple sets of data
Data Collected
Average Time Spent Watching TV
in Mrs. Ellwood's Class
Time (minutes)
Monday
37
Tuesday
40
Wednesday
39
Thursday
43
Friday
52
Saturday
83
Sunday
80
Average Time Spent Watching TV in Mrs.
Ellwood's Class
90
83
80
80
70
Time (min.)
60
52
50
40
37
40
39
43
30
20
10
0
Monday
Tuesday Wednesday Thursday
Friday
Days Spent Watching TV
Saturday
Sunday
How We Made the Graph
 Draw and label a x- axis and y- axis
 Create a scale on each axis
 Plot your data points
 Connect each point
with line segments
 Give your graph a title
Time (min.)
Average Time Spent Watching TV in
Mrs. Ellwood's Class
90
80
70
60
50
40
30
20
10
0
83
37
40
39
43
52
Days Spent Watching TV
80
Quiz Question
A TV company wants to schedule commercials during
the day kids watch the most amount of TV. Mrs.
Ellwood’s class was selected to complete a survey based
on how much TV they watch. Find the largest increase
in time TV was watched. Then, find the percent of
increase of time TV was watched.
Average Time Spent Watching TV in Mrs.
Ellwood's Class
90
83
80
80
70
Time (min.)
60
52
50
40
37
40
39
43
30
20
10
0
Monday
Tuesday Wednesday Thursday
Friday
Days Spent Watching TV
Saturday
Sunday
How to Solve
 Find the largest increase in the graph.
From Friday to Saturday, the increase in time
was greatest
 Then find percent of increase to the nearest
tenth

Difference
Original
=
83-52
52
≈ 59.6%
Advantages of Line Graphs
 Can visually see the trend of the data
 Can see how data increases/decreases
 Can compare two sets of data
 Use a line graph with multiple sets of data
Disadvantages of Line Graphs
 Hard to see the specific data points when the scale is
large
 Sometimes the scale can change the appearance of the
data
Works Cited
 Evernote. Evernote, n.d. Web. 12 Feb. 2013.
<https://www.evernote.com/shard/s134/sh/f11fa37a-5379-4447-a72249ed3115b924/21ea4dd75a2f06164cb77028883a617a>.
 Graphing Tutorial. Graphing Tutorial, n.d. Web. 14 Feb. 2013.
<http://nces.ed.gov/nceskids/help/user_guide/graph/line.asp>.
 Line Graph. New York State Intermediate Test Prep Center, 2001-2011. Web. 17
Feb. 2013. <http://www.studyzone.org/mtestprep/math8/f/linegraphles.cfm>.
 Line Graphs. N.p., n.d. Web. 17 Feb. 2013.
<http://mste.illinois.edu/courses/ci330ms/youtsey/lineinfo.html>.
 OnlineMathLearning.com. OnlineMathLearning.com, 2005-2012. Web. 15 Feb.
2013. <http://www.onlinemathlearning.com/line-graphs.html>.
 Teacher Vision. Daily Teach, 2000-2013. Web. 14 Feb. 2013.
<http://www.teachervision.fen.com/tv/printables/SISA00181_3.pdf>.