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Summary

  • The horizontal real line is called x-axis and the vertical line is called y-axis.
  • The point of intersection of these two axes is called the origin and it is denoted by O.
  • The x -co-ordinate is also called abscissa and the y -co-ordinate is also called ordinate.
  • The axes divide the plane into four regions called quadrants.
  • The coordinates of the origin are (0, 0).
  • The positive numbers appear to the right of the origin on the x - axis and above the origin on the y - axis.
  • The negative numbers appear to the left of the origin on the x - axis and below the origin on the y - axis.
  • In an ordered pair the first number denoted the x – axis and the second number denoted the y – axis.
  • The coordinates of a point on the x - axis are of the form (x, 0).
  • The coordinates of a point on the y - axis are of the form (0, y).
  • In first quadrant both are positive; second quadrant y is positive and x is negative; the third quadrant y is negative and x is negative; the fourth quadrant x is positive y is negative.




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