The x-coordinate represents the position of the point on a plane in the point of view of horizontal x-axis. It is measured from the origin of x-axis and the measurement of distance is in the direction parallel to the x-axis. The distance is called x-coordinate in the Cartesian coordinate system.
and are four points on a plane.
The four points are at four different locations on the plane. The position of each point can be identified by measuring the distance from origin of x-axis but the measurement of horizontal distance of every point should be in the direction parallel to the x-axis.
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