Because not all equations have the co-ordinates 0,0 in their data range.
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tables, diagrams, bar graphs, forms, maps
Graphs are a convenient way to impart information to some people, and graph paper simplifies the process of producing graphs.
Some data.
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.