The first or X-co-ordinate is zero all along the vertical axis aka the Y-axis.
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Its y-coordinate is zero.
The simple answer is "the coordinates". A more pedantic answer is abscissa along the horizontal axis and ordinate on the vertical axis.
"The" vertical line is wrong; there are lots of vertical lines on a coordinate plane. In the usual x-y coordinate system, such a line has an equation of the form:x = a (for some constant "a"); for example: x = 3
Two axis. The x (horizontal) axis, and the y (vertical) axis.
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