# Plotting Points on a Coordinate Plane (Coordinates on a Graph)

The Cartesian Coordinate System is two perpendicular and graduated lines that intersect at a point called **the origin of the coordinate axis**.

In the plane attributed to this system of coordinates, we can mark any point with a pair of coordinates(-coordinate and -coordinate).
Before we get to know and , let's first get to know the graphic of the Coordinate Axis.

Perpendicular lines make up four quadrants, as shown below.

The two graduated axes have their own name:

- The horizontal axis is called the
**-axis** or **the abscissa axis**, and is graded incremental from left to right. - The vertical axis is called the
**-axis** or **the ordinates axis**, and it is graded incremental from bottom to top.

The point of their intersection is called **the origin ** of The Cartesian Coordinate System, and we write

## How to plotting a given point on a coordinate plane.

- We mark the real number on the -axis and drawing a line (1) pass through and parallel to the -axis.
- We mark the real number on the -axis and drawing a line (2) pass through and parallel to the -axis.
- The intersection of the two lines (1) and (2) is the coordinates of the point

**Example1:**

Let's plot the point on the coordinates axis.

We mark the number 2 in the -axis, and we mark the number -3 in the -axis.

Let's plot the point on the coordinates axis.

We mark the number 0 in the -axis, and we mark the number 6 in the -axis.

### Note:

When an abscissa is zero , the point belongs to the ordinate axis.Let's plot the point on the coordinates axis.

We mark the number -3 in the -axis, and we mark the number 0 in the -axis.

### Note:

When an ordinate is zero , the point belongs to the abscissa axis.Let's plot the point on the coordinates axis.

We mark the number 1 in the -axis, and we mark the number 5 in the -axis.

Let's plot the point on the coordinates axis.

We mark the number -6 in the -axis, and we mark the number -4 in the -axis.