A point of the form $(0,k)$ with $k\neq 0$ lies on:

A point of the form $(0,k)$ with $k\neq 0$ lies on:
  1. The $x$-axis
  2. The $y$-axis
  3. The origin
  4. The line $x=y$

Solution

If the abscissa is $0$, the point has no horizontal displacement, so it lies on the vertical ($y$) axis.

Asked in: IMO

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