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 Related Terms
 x-axis:  The horizontal number line on the Cartesian coordinate plane.
Coordinate Plane: A two-dimensional region determined by a pair of axes and that uses numerical values to represent the location of an object.
Horizontal Line: A line that goes left and right.
Origin: The point of intersection of the vertical and horizontal axes of a Cartesian plane. The coordinates of the origin are (0, 0).
Axis: A reference line used in a graph or coordinate system.
Half-plane: The portion of a plane on one side of a line extending on the plane.
y-axis: The vertical number line on the Cartesian coordinate plane.