Coordinate geometry is that branch of mathematics which unifies algebra with geometry.
Coordinate Axes
If a pair of perpendicular lines XOX' and YOY' intersect at O, then these lines can be called co-ordinate axes. The axes divide the plane into four quadrants.
'Axes' is plural of the word 'Axis'.
The plane containing the axes is called the Cartesian Plane.
The lines XOX' and YOY' are usually drawn horizontally and vertically and are known as x-axis and y-axis respectively. The point of intersection of axes the point O is called 'the origin'.
The abscissa and ordinate of a point taken together are called its coordinates.
For example, if the abscissa of a point is 4 and ordinate is 4, then the co-ordinates of the point are written as (4, 4).
To plot a point (4,4)
