Replace each point with coordinates (x, y) by (-x, y).
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It can be.
If it is Rx=0, it means you are reflecting your set of coordinates and reflect it across the x-axis when x=0. So it pretty much is saying reflect it over the y-axi
Reflection across the y-axis changes the sign of the x - coordinate only, that is, (x, y) becomes (-x, y).
X axis is across and Y axis is down
The bit with the negative x-axis goes to the positive x-axis.