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A double line graph is a line graph with two lines. It has a row of numbers on two sides, showing the intervals, i.e. time, population, concentration of a substance. This is so it can be used to show the change and the rate of change, and the difference between the rates of change of two or more dynamic phenomenon.
Double Line Graph
This one explains the stars ppg/60, stars ppga/60, and the nhl average in the states. So you just get the information that it gives you and you plot them were it needs to go and just connect the lines and there you have a double line graph.
This one explains the ice sheet areas in March and April and in the years ithat it happened /the most that it happened in. So you pick a color for each item that you are doing and then you plot the things that it tells you to plot. Next you connect the dots together. Then you do the same thing with the othem item. Thats all you have to do to get a double line graph. Its really easy.
In real life you would use the double line graph in an office or being a nurse/doctor.
You would find the double line graph, if someone is comparing two or more things or in stocks.