A point whose $y$-coordinate is $0$ always lies on the:

A point whose $y$-coordinate is $0$ always lies on the:
  1. $y$-axis
  2. $x$-axis
  3. Origin only
  4. Line $y=x$

Solution

Any point $(x,0)$ has zero vertical displacement, so it lies on the horizontal $x$-axis.

Asked in: IMO

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