Economists often use graphs to analyze the choices and trade-offs that people make. Graphs help us see how one value relates to another value.
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Mathematicians use graphs to illustrate information.
Bar graphs and line graphs.
The answer depends on what information is graphed. There are distance-time graphs, velocity-time graphs, speed-time graphs, acceleration-time graphs.
to interpret, and analyse data. to be able to see it clearly, with graphs you can find out important facts about the data you collected and use what you know to improve or change something.