What is the coefficient of $xy$ in $-xy + 5x^{2}y - 2xy + 3$?

What is the coefficient of $xy$ in $-xy + 5x^{2}y - 2xy + 3$?
  1. $-1$
  2. $-2$
  3. $-3$
  4. $5$

Solution

Combine the $xy$ terms: $-xy - 2xy = -3xy$. Coefficient is $-3$.

Asked in: IMO

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