Coordinates of a Point

To write the coordinates of a point we need to follow these rules-

  • The x – coordinate of a point is marked by drawing perpendicular from the y-axis measured a length of the x-axis .It is also called the Abscissa.
  • The y – coordinate of a point is marked by drawing a perpendicular from the x-axis measured a length of the y-axis .It is also called the Ordinate.
  • While writing the coordinates of a point in the coordinate plane, the x – coordinate comes first, and then the y – coordinate. We write the coordinates in brackets.

The relationship between the signs of the coordinates of a point and the quadrant of a point in which it lies.

QuadrantCoordinateSign in the quadrant
I(+, +)1st quadrant is enclosed by the positive x-axis and the positive y-axis.
II(-, +)2nd quadrant is enclosed by the negative x-axis and the positive y-axis.
III(-, -)3rd quadrant is enclosed by the negative x-axis and the negative y-axis.
IV(+, -)4th quadrant is enclosed by the positive x-axis and the negative y-axis

Example:

Plot the points (6, 4), (- 6,- 4), (- 6, 4) and (6,- 4) on the Cartesian plane.

Solution:

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