Y = 0
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x = 0.
The y-axis has the equation x=0, so every point on the y-axis has an x coordinate of zero.
Typically the y-axis is the vertical axis and x-axis if horizontal. This is by convention and not required.This is used to plot a binomial (two variable) equation.
It is called the x-intersect.
Since the line is verticle, the only axis that can define the line is the x-axis. Therefore the equation of a verticle line is always in the form of x=a, where a is some constant. For example, x=1; this means that the verticle line passes through the point (1,0)i.e the x axis at 1.