#### Introduction

- Cartesian coordinates are a way of describing the location of a point in space.
- For two dimensional space, two axis are defined, x and y, which are right angles (orthogonal) to each other:
- A point in space can then be described by how far it is from each axis:
- The
**x**coordinate describes how far the point is from the y axis, in this case it is 70. - The
**y**coordinate describes how far the point is from the x axis, in this case it is 50. - The point is represented as a pair of coordinates
**(x, y)**, in this case it is (70, 50).

#### Higher dimensions

- Cartesian coordinates can be used to represent coordinates in higher dimensions too.
- For example, (2, 3, 5) represents a point in 3d space.