The best spot for math. Mathematical "X" Words
*Dictionary Alert

x-axis  The horizontal number line in a coordinate graph. The line in the coordinate plane or in space, usually horizontal, containing those points whose second coordinates (and third, in space) are 0.
in a flat plane in space it looks like this

x-coordinate  The first coordinate of an ordered pair or an ordered triple.

Ex: in the coordinate pair (3,-8), the three is the x-coordinate.

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