Cartesian coordinates.
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X comes first :)
Yes. That property is called anticommutative.
An identity is a statement which says two quantities are equal, like as x + y = y + x or sin (x + y ) = sin x cos y + cos x sin y .
The first coordinate always is called the "x" coordinate, because it goes on the "x" axis, while the second coordinate is always called the "y" coordinate because it always goes on the "y" axis.
The point where the x-axis and the y-axis meet is called the origin.