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GMATPrep: DS

by kookoo4tofu » Mon May 07, 2007 9:07 am
anyone know how to solve this one? details please. thanks!

In the x-y plane, does the line with equation y=3x+2 contain the point (r,s)?
(1) (3r+2-s)(4r+9-s)=0
(2) (4r-6-s)(3r+2-s)=0
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Re: GMATPrep: DS

by jayhawk2001 » Mon May 07, 2007 6:42 pm
kookoo4tofu wrote:anyone know how to solve this one? details please. thanks!

In the x-y plane, does the line with equation y=3x+2 contain the point (r,s)?
(1) (3r+2-s)(4r+9-s)=0
(2) (4r-6-s)(3r+2-s)=0

1 - insufficient. We know (3r + 2 -s = 0) OR (4r + 9 - s = 0).

2 - insufficient. We know (4r - 6 - s = 0) OR (3r + 2 - s = 0)

1 and 2 together are sufficient. Hence C
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