A point is represented in a 2-dimentional coordinate geometrical system (like x-y plane) with x-y axes, as (x , y) . x is called ascissa and y is called ordinate of the point.
Origin of the system is denoted by (0, 0 ).
A point (1 , 2 ) on the graph is plotted by traveling 1 units (small squares) on to the right of origin and then 2 units upwards vertically. A point (4 , 4) is plotted by finding 4 units to the right of origin on the x axis and then moving upwards 4 units.