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Which of the following is perpendicular to y=5x? 1) y = -5x

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Senior Manager
Senior Manager
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Joined: 08 Aug 2005
Posts: 251
Followers: 1

Kudos [?]: 9 [0], given: 0

Which of the following is perpendicular to y=5x? 1) y = -5x [#permalink] New post 05 May 2006, 22:03
Which of the following is perpendicular to y=5x?

1) y = -5x
2) y = 5/x
3) y = -5/x
4) y = x/5
5) y = -x/5
Director
Director
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Joined: 16 Aug 2005
Posts: 950
Location: France
Followers: 1

Kudos [?]: 8 [0], given: 0

 [#permalink] New post 16 May 2006, 15:12
product of slopes for both lines should be -1

Hence (5)
  [#permalink] 16 May 2006, 15:12
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Which of the following is perpendicular to y=5x? 1) y = -5x

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