The y-coordinate would be zero. The y-coord. measures far up or down the point is vertically, so if the point is on the x-axis it has to be zero.
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Its y-coordinate is zero.
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.
A Cartesian coordinate system, or rectangular coordinate system, is a 2-dimensional coordinate system. The X-axis and Y-axis only intersect at one special point called the origin. This point has the coordinates of (0,0).Wikipedia has particulars, and a link is provided.
point of origin