The points $(2,3)$, $(2,-1)$ and $(2,5)$ all lie on a:

The points $(2,3)$, $(2,-1)$ and $(2,5)$ all lie on a:
  1. Horizontal line
  2. Vertical line through $x=2$
  3. Line through the origin
  4. Circle

Solution

All three points share $x=2$, so they lie on the vertical line $x=2$.

Asked in: IMO

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