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

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05 May 2006, 23:03
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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: 938
Location: France

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16 May 2006, 16:12
product of slopes for both lines should be -1

Hence (5)
16 May 2006, 16:12
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