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You need a pair of numbers to locate a point in 2-dimensions. Only one number would be required in 1-dimension; 3 numbers would be needed in 3-dimensions, etc.

If you have a two dimensional plane and you choose an arbitrary point on it as your origin, then any point on that plane can be uniquely identified by the use of two numbers. The two numbers can represent the distance of the point from two axes. In the Cartesian plane these are the x and y axes and they are perpendicualr to one another (orthogonal) but that is not necessary. Alternatively, you could use polar coordinates (distance from origin and angle made with the "horizontal" axis) as your two numbers.

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Q: Why do you need a pair of numbers to locate a point?
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