Definitions and notations

Order Pair:

A pair of two real number written in fix order within parenthesis. It represent the position of the point in the cartesian plane.

For Example: $(3,2)$

This is defining the point on $3^{rd}$ row and $2^{nd}$ column or the value of $x$ is $3$ and the value of $y$ is $2$

Cartesian/Rectangular Plane:

The cartesian coordinate system consist of two real number lines that intersect at a right angle at point O, where both the number plane have value 0. These two lines define a flat surface called Cartesian plane.

Origin:

The point of intersection of both the number lines in the cartesian coordinate system.

X-Axis:

X-axis is the horizontal number line of the cartesian plane.

Y-Axis:

Y-axis is the vertical number line of the cartesian plane.

Abscissa:

The value of x in the order pair is called abscissa.

Ordinate:

The value of y column in the order pair is called ordinate