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2017 AMC 10B Question 10

AMC10 · 2017 AMC 10B

Question 10

The lines with equations $ax-2y=c$ and $2x+by=-c$ are perpendicular and intersect at $(1, -5).$ What is $c?$
  1. $ -13 $
  2. $ -8 $
  3. $ 2 $
  4. $ 8 $
  5. $ 13 $