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

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

Kudos [?]: 19 [0], given: 0

Which of the following is perpendicular to y=5x? 1) y = -5x [#permalink]  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
Joined: 16 Aug 2005
Posts: 946
Location: France
Followers: 1

Kudos [?]: 10 [0], given: 0

product of slopes for both lines should be -1

Hence (5)
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