From: Sonam Shehravat on
Several methods have been developed by mathematicians to uniquely
locate the position of a point in space. The easiest and most widely
used one is the Cartesian Coordinate System, which is based on
mutually perpendicular axes. In this chapter you will learn about this
systems: locating a point in these systems and finding the equation of
line passing through these points. Read more -
http://smartlearnwebtv.com/iitjee/IITJEE/introduction-8/