## 1. Order Pair : A pair of numbers a and b listed in a specific order with a at the first place and b at the second place is called an ordered pair (a , b)

i.e , ( a , b ) ≠ ( b ,a )

2. Co – ordinate Axes : The position of a point in a plane is determined with reference to two fixed mutually perpendicular lines , called the coordinate axes.

Lines X^{l} OX and Y^{l} OY are known as coordinate axes.

3. Coordinate of a point in a Plane : Let P be a point in a Plane

Let the distance of P from the y – axis = a units.

and the distance of P from the x – axis = b units

∴ the coordinate of P are (a , b)

a is called the x – coordinate, or abscissa of P

b is called the y – coordinate , or ordinate of P

4. Quadrants : Let X^{l} OX and Y^{l} OY be the coordinate axes.

5. Co-ordinate on axis :

6. Co-ordinate in various quadrants :

7. Mirror Images of Co – ordinate axis :

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