A point $Q$ lies on the $y$-axis at a distance of $7$ units above the origin. The coordinates of $Q$ are:

A point $Q$ lies on the $y$-axis at a distance of $7$ units above the origin. The coordinates of $Q$ are:
  1. $(7,0)$
  2. $(0,7)$
  3. $(0,-7)$
  4. $(-7,0)$

Solution

On the $y$-axis the abscissa is $0$. Above the origin means $y>0$, so $Q=(0,7)$.

Asked in: IMO

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