Reflecting about the xAxis

Here, the Mona Lisa is reflected about the xAxis. Drag points B, C, and the pre-image picture around and observe how her reflection changes.
In the app above, move Lisa around to get different preimage points. Then, record their images in the image column.
Take a look at the table of data above. Notice any patterns? If so, describe!
Suppose a point [b]([i]a[/i], [i]b[/i])[/b] is reflected about the xAxis. What would the coordinates of its image be? Express in terms of [b][i]a[/i] [/b]and [b][i]b[/i].[/b]
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– Tim Brzezinski

Information: Reflecting about the xAxis