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A shop plots (month number, bags sold) and gets the points (1, 20), (2, 35), (3, 50) and (4, 15). Which plotted point shows the month with the greatest sales?

Class 9Coordinate GeometryCoordinate Geometry
  • A(3, 50)
  • B(50, 3)
  • C(4, 15)
  • D(1, 20)

Step-by-Step Solution

The number of bags is the ordinate, and the largest ordinate is 50, which belongs to month 3. A point is always written with the abscissa first, so it is (3, 50) and not (50, 3).
Answer: A) (3, 50)

Key idea: Special points

- **Origin**: (0, 0).
- **On -axis**: , so the form is (a, 0). Examples: (3, 0), (−5, 0).
- **On -axis**: , so the form is (0, b). Examples: (0, 7), (0, −2).
- **First-quadrant point**: both positive.
- **Third-quadrant point**: both negative.

Knowing which axis or quadrant a point belongs to is a quick check that you've plotted it correctly.

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