it is assumption in the mathematics. It is also related to the earth pheripheral
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because they are normally the unknown variables
The point (0, 0) where the x-axis intercepts the y-axis is called the Origin.
The y axis is the vertical axis and a y coordinate is the 'ordinate' The x axis is the horizontal and a x coordinate is the 'abscissa'
It is the origin
It is called the cartesian plane