The value of the y coordinate of any point on the x axis is always 0.
Explanation
Suppose, the co ordinate of any point is [tex](a,b)[/tex] .
It means, the distance of the point from x-axis is '[tex]b[/tex]' and distance from y-axis is '[tex]a[/tex]'.
Now if the point lies on the x-axis, that means the distance of the point from x-axis will be 0. Thus, the value of '[tex]b[/tex]' will be 0.
So, the value of the y coordinate of any point on the x axis is always 0.
