A line graph shows changes over time and is used to display data measured at different points in time, such as monthly rainfall. It always includes a title and two labeled axes, with time typically plotted along the horizontal x-axis. Intervals should be chosen appropriately so the graph is easy to read, without having too many data points. To interpret a line graph, you need the information on the axes to determine what is being measured and compare values at different points in time shown on the graph.

1. Graphs 11/20/11

7. YOU TELL ME…. 11/20/11 What color is the y-axis? What color is the x-axis? Y X

9. Do these have the same information on them? 11/20/11

11. 11/20/11 Time Car Trip

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14. Q & A 11/20/11 Which day did this person spend the most money? How do you know? This person spent the most money on Wednesday. I know this because the graph is the highest on Wednesday. About how much money in total did this person spend on Monday and Thursday? How do you know? This person spent about $9.00 on Monday and Thursday. I know this because I looked at where the line was for Monday and Thursday and added the two amounts.

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16. Q & A 11/20/11 About how much corn did the U.S. have in 1991? What does the y-axis represent in the graph? Can you think of another title for this graph? About 77 million acres The rise and fall of corn in the U.S. Acres of corn in millions.

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18. Q & A 11/20/11 How many days did this person travel less than 30 miles? Which day did the driver travel the least amount of miles? Why might someone want to keep track of their miles for the week? 5 days Sunday To figure out how much gas they need a week.

19. Great Job! 11/20/11