the start on the x axis or the horizontal line! (x,y)
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Oh, dude, coordinates start with the x-axis. It's like the OG axis, you know? The y-axis is just there to keep it company and make sure it doesn't get lonely. So yeah, x marks the spot where all the fun begins.
y' = y, x' = -x.
Replace each point with coordinates (x, y) by (-x, y).
Reflection across the y-axis changes the sign of the x - coordinate only, that is, (x, y) becomes (-x, y).
It is called the x and y axis
It terms of the order in which the coordinates are given, yes.