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On a reading chart the horizontal axis shows the day number and the vertical axis shows the number of pages read. One plotted point is (4, 30). What does this point tell you?

Class 9Coordinate GeometryCoordinate Geometry
  • AOn day 30, four pages were read.
  • BOn day 4, thirty pages were read.
  • CAltogether 34 pages were read.
  • DFour pages were read on each of 30 days.

Step-by-Step Solution

The abscissa is measured along the horizontal axis, which shows the day, and the ordinate along the vertical axis, which shows the pages. So (4, 30) means 30 pages on day 4.
Answer: B) On day 4, thirty pages were read.

Key idea: Reading coordinates

Given a point on a graph:
1. Drop a perpendicular to the -axis. Where it hits is the -coordinate.
2. Drop a perpendicular to the -axis. Where it hits is the -coordinate.
3. Combine: .

Reverse if you're given coordinates: read first (horizontal direction), then (vertical direction). Don't swap their roles.

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