The X coordinate always goes first think a baby crawls before it walks
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You know which is the x coordinate and which is the y coordinate because (x,y) is an ordered pair. The x is always first and the y second. For example, the point (4,5) has x coordinate of 4 and y of 5.
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 x coordinate for all y intercepts is 0, just as the y coordinate for all x intercepts is 0.
Other way around (X,Y)
x-coordinate: abscissa y-coordinate: ordinate