Reflection in the x axis

What stays the [b]same[/b] and what [b]changes[/b] as you move the points around?[br]Are there any points that do not move under this transformation?[br]Where would the co-ordinate (x,y) map to?
[color=#0a971e]Created by N.Trubridge[/color]
What happens
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– Nicola Trubridge

Information: Reflection in the x axis