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 Xl OX and Yl 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 Xl OX and Yl 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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