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A coordinate plane is a two-dimensional coordinate system. It is a grid that results from intersecting a vertical number line with a horizontal number line at their zero points. The horizontal number line is usually named the x-axis and the vertical number line is usually the y-axis.
In a three-dimensional coordinate system, three axes intersect. Each axis is perpendicular to the other two axes. These axes are commonly labeled as the x-axis, the y-axis, and the z-axis. The origin of this system is the point (0,0,0) where the three axes intersect.