Mark M. answered • 09/22/18

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Retired Math prof with teaching and tutoring experience in trig.

If the point (1,-4) is reflected in the line x=2 (a vertical line), then the y-coordinate is unchanged. The x-coordinate of the original point (preimage) is one unit less than 2, so the x-coordinate of the reflected point is one unit more than 2.

So, the point (1,-4) is reflected to the point (3,-4).