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# Find 'p' if the equations forming the straight lines

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Senior Manager
Joined: 30 Aug 2003
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Find 'p' if the equations forming the straight lines [#permalink]

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06 Mar 2004, 17:24
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Find 'p' if the equations forming the straight lines 2x+4y+7=0 and px+8y+9=0 are perpendicular to each other.

-4
8
-16
-16/3

_________________

Pls include reasoning along with all answer posts.
****GMAT Loco****
Este examen me conduce jodiendo loco

Senior Manager
Joined: 05 Feb 2004
Posts: 290
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06 Mar 2004, 20:16
Product of slopes m1 & m2= -1
(-1/2)&(-p/8) = -1
p = -16!!
06 Mar 2004, 20:16
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