It a branch of geometry which sets up a definite correspondence between the position of a point in a plane and a pair of algebric numbers called co-ordinates

1) We require two perpendicular axes to locate a point in the plane. One of them is horizontal and other is Vertical

2) The plane is called Cartesian plane and axis are called the coordinates axis

3) The horizontal axis is called x-axis and Vertical axis is called Y-axis

4) The point of intersection of axis is called origin.

5) The distance of a point from y axis is called x - coordinate or abscissa and the distance of the point from x – axis is called y - coordinate or Ordinate

6) The x-coordinate and y - coordinate of the point in the plane is written as (x, y) for point and is called the coordinates of the point

7) The Origin has zero distance from both x-axis and y-axis so that its abscissa and ordinate both are zero. So the coordinate of the origin is (0, 0)

8) A point on the x - axis has zero distance from x-axis so coordinate of any point on the x - axis will be (x, 0)

9) A point on the y - axis has zero distance from y-axis so coordinate of any point on the y - axis will be (0, y)

10) The axes divide the Cartesian plane in to four parts. These Four parts are called the quadrants

11) The coordinates of the points in the four quadrants will have sign according to the below table

1) Suppose the linear equation is

y=3x+1

Prepare a table of values of x and corresponding values of y

So in this particular case

x | 1 | 2 | 3 | 4 | 5 |

y | 4 | 7 | 10 | 13 | 16 |

2) Plot these points on the Cartesian plane

3) Join them by the straight line

Given below are the links of some of the reference books for class 9 Math.

- Mathematics for Class 9 by R D Sharma One of the best book for studying class 9 level mathematics. It has lot of problems to be solved.
- Secondary School Mathematics for Class 9 by R S Aggarwal This is also as good as R.D. Sharma. Either this or the book by R.D. Sharma will do. I find book R.S. Aggarwal little bit more challenging than the one by R.D. Sharma.
- Pearson IIT Foundation Series - Maths - Class 9 Buy this book if you want to challenge yourself further and want to prepare for JEE foundation.
- Pearson IIT Foundation Physics, Chemistry & Maths combo for Class 9 Only buy if you are prepared to study extra topics and want to take your studies a step further. You might need help to understand topics in these books.

You can use above books for extra knowledge and practicing different questions.

Class 9 Maths Class 9 Science

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