Algebra: Coordinate systems, graph plotting, etc

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You can think about a coordinate system as two number lines, one horizontal and one vertical. Unlike number lines, which are good for displaying individual numbers, coordinate system is good for displaying pairs of numbers. They are useful for plotting graphs.
This module discusses coordinate systems, graph plotting, special points, distances between points, and more. 		graph%28+200%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+x%5E2-2x-4%29+

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