A rectangular coordinate plane, also known as a Cartesian plane, comprises an infinite plane (or a part of one) with a pair of axes that meet at right angles. The "horizontal" axis (x-axis) goes from left to right while the "vertical" axis (y-axis) goes from bottom to top. The axes meet at the origin and the location of every point in the plane is uniquely identified by an ordered pair. The first number in the ordered pair is the signed distance from the origin to the point in the direction of the x-axis while the second is the corresponding measure along the y-axis.
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The Rectangular Coordinate Plane
Descartes
Cartesian coordinate system.
graphing tool
A point's y coordinate is its vertical position, or how high or low it is.