calculus

Find all values of 'a' such that y=a/(x−9) and y=x^2−18x+81 intersect at right angles.
show steps please :)

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asked by anna
  1. I did this one on Wednesday

    http://www.jiskha.com/display.cgi?id=1319657997

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    posted by Reiny
  2. thanks!

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    posted by anna

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