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SMO 2009 Junior Round 1 Question 5

SMO · SMO 2009 Junior Round 1

Question 5

Given negative integers $x,y$ satisfying $y=\dfrac{10x}{10-x}$, find the maximum value of $y$.
  1. $-10$
  2. $-9$
  3. $-6$
  4. $-5$
  5. None of the above.