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The first number in an ordered pair (of rectangular coordinates) is the distance from the origin along the x- axis.

If the number is 0, then any point having this coordinate must lie on the y-axis.

If the second number is 0 then the point is at the origin (0,0).

If the second number is positive then the point lies on the y-axis above the origin.

If the second number is negative then the point lies on the y-axis below the origin.

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