What is another way to refer to a coordinate pair?

• A. Coordinate System
• B. Grid Point
• C. Ordered Number Pair
• D. Vector

Answer: (C)

Two numbers that describe a location on a grid are placed in a specific order, so the term “ordered number pair” fits exactly. The first number tells how far to move horizontally and the second tells how far to move vertically, and the order matters. A coordinate system is the whole framework for describing locations, not just a single pair of numbers. A grid point is a location on the grid, which can be described by a coordinate pair but isn’t itself the name for the two numbers. A vector is a quantity with both magnitude and direction, not merely a point described by two coordinates. So the phrase that best captures a coordinate pair is the ordered number pair, since it highlights both the two numbers and the importance of their order.