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In an ordered pair for a point in the xy-plane the first number is the x-coordinate and the second is the y-coordinate.

(2, 5) is the point with an x-coordinate of 2 and a y-coordinate of 5;

(5, 2) is the point with an x-coordinate of 5 and a y-coordinate of 2.

Only if the x- and y- coordinates are equal are the points the same point.

However, the point (5, 2) is the reflection of the point (2, 5) in the line y = x.

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