
1. There is onetoone corresponding between the pints of a plane and the ordered pairs of real numbers.
2. The plane is divided into 4 quadrants by the axes of coordinates. 3. In a coordinate system the horizontal line is called the Xaxis and vertical line is called the Yaxis. The point of intersection of these axes is called the origin. 4. In an ordered pair (x,y), x is called the first coordinate or Xcoordinate and y is called the second coordinate or Ycoordinate.
5. The slope of a line passing through A(x_{1},y_{1}) and B(x_{2},y_{2}) is 6. Two lines are parallel if and only if their slopes are equal. 7. The equation of a line passing through the origin with slope m is y = mx.
8. The distance between the points A(x_{1},y_{1}) and B(x_{2},y_{2}) is 9. The distance from (0,0) to (x,y) is Ö(x^{2} + y^{2}).
10. The mid point of the segment joining (x_{1},y_{1}) and (x_{2},y_{2}) is 11. The general form of a linear equation is ax + by + c = 0, where, a ¹ 0 and b ¹ 0.
12. The pointslope form of a line
13. The slopeintercept form of a line
14. The equation of a line passing through (x_{1},y_{1}) and (x_{2},y_{2}) is
15. The intercept form of a line is
16.The general form of a line is 17. The angle made by a line with xaxis in the anticlockwise direction is called its steepness or inclination. 18. The lines are perpendicular if the product of their slopes is 1. Directions: Choose the correct answer. 