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Find 'p' if the equations forming the straight lines

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Senior Manager
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Find 'p' if the equations forming the straight lines [#permalink] New post 06 Mar 2004, 16:24
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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
:circle
_________________

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

Senior Manager
Senior Manager
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Joined: 05 Feb 2004
Posts: 291
Location: USA
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Kudos [?]: 2 [0], given: 0

GMAT Tests User
 [#permalink] New post 06 Mar 2004, 19:16
Product of slopes m1 & m2= -1
(-1/2)&(-p/8) = -1
p = -16!!
  [#permalink] 06 Mar 2004, 19:16
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Find 'p' if the equations forming the straight lines

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