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In the Cartesian coordinate system, there is a Cartesian plane which is made up of two number lines which are perpendicular to each other, i.e. **x-axis (horizontal)**** and ****y-axis (vertical)**. These two perpendicular lines are called the coordinate axis.

- The intersection point of these two lines is known as the center or the
**origin**of the coordinate plane. Its coordinates are**(0, 0).** - Any point on this coordinate plane is represented by the ordered pair of numbers. Let (a, b) is an ordered pair then a is the x-coordinate and b is the y-coordinate.
- The distance of any point from the y-axis is called its
**x-coordinate or****abscissa and**the distance of any point from the x-axis is called its**y-coordinate or ordinate****.**

The Cartesian plane is divided into four quadrants I, II, III and IV.

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