A line graph is a graph used to show the change in a set of data over a period of time.
For example, the line graph below show the profits of a company over several years ( from 2006 to 2013).
Notice that the graph use line segments to connect points. You can see that profits for this company generally increased from 2006 to 2013.
You can also see that profits did not change from 2012 to 2013.
You can use a line graph to look for trends and make predictions. For example, after examining the graph above, you can conclude that profits may increase in 2014.
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