[To solve such questions, following are the key points:
1. X coordinate of any point on Y axis is 0.
2. Y coordinate of any point on X axis is 0.
3. If a line is parallel to X axis, then its X coordinate varies, but Y coordinate remains constant.
4. If a line is parallel to Y axis, then its Y coordinate varies, but X coordinate remains constant.]
Since, the equation of X – axis is y = 0, y coordinate of any point on X – axis is 0(zero).
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