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Cartesian coordinate system

Cartesian coordinate system

 
In the first quadrant, the x-coordinate and the y-coordinate are always posit...
 
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Cartesian coordinate system discussion
 
ilovemath
12/20/09
In the first quadrant, the x-coordinate and the y-coordinate are always positive. Why do the points in the other three quadrants have a different outcome? Can you please explain and prove it?