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For which of these points is the abscissa equal to the ordinate?

Class 9Coordinate GeometryCoordinate Geometry
  • A(4, −4)
  • B(−4, −4)
  • C(0, 4)
  • D(−4, 4)

Step-by-Step Solution

Abscissa equal to ordinate means the two coordinates are exactly the same number, sign included. Only (−4, −4) satisfies this; in the others the signs or the values differ.
Answer: B) (−4, −4)

Key idea: Plotting a point

To plot :
1. Start at the origin.
2. Move units along the -axis (right if positive, left if negative).
3. Move units along the -axis (up if positive, down if negative).
4. Mark the point.

Example: (3, −2). From origin, 3 right, 2 down. Lands in quadrant IV.

**Coordinates are ordered**: (3, 2) and (2, 3) are different points.

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