The reflection of the point $(-4,2)$ in the $y$-axis is:

The reflection of the point $(-4,2)$ in the $y$-axis is:
  1. $(4,2)$
  2. $(-4,-2)$
  3. $(4,-2)$
  4. $(2,-4)$

Solution

Reflection in the $y$-axis flips the sign of $x$. So $(-4,2)\to (4,2)$.

Asked in: IMO

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