The coordinate of a point and its image after a reflection are given. Identify the line of reflection.
$(2, 1) \to (2, - 1)$

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Solution

Check the line of reflection.
Given, coordinates of reflection of a point.
$(2, 1) \to (2, - 1)$
From the given coordinates, we can observe:
The $x -$ coordinate of both points and its image are the same but the $y -$ coordinate of the image is the opposite in sign as of its position.
Hence, $x -$ axis is the line of reflection.

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