##### Coordinate Geometry – Notes

**Cartesian Plane**

** **The Cartesian plane, named after the mathematician “Rene Descartes”, is plane with a rectangular coordinate system that associates each point in the plane, with an ordered pair (x, y).

In an ordered pair (x, y):

- x is called the x-coordinate or abscissa.
- y is called the y-coordinate or ordinate.

Any point on the x-axis has the coordinate (x, 0).

Any point on the y-axis has the coordinate (0, y).

The equation of the y-axis is x = 0.

The equation of the x-axis is y = 0.

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CBSE Class 9th Maths 3 - Coordinate Geometry - Notes

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