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DS -GMAT Prep2 - coordinate geometry

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DS -GMAT Prep2 - coordinate geometry [#permalink] New post 28 Apr 2007, 15:07
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Please try to solve it.
I am taking the test very, very soon! :)

Thanks!!!
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 [#permalink] New post 29 Apr 2007, 08:47
C

y1 = m1 * x1 + b1
y2 = m2 * x2 + b2


Stmt 1)
(b1/m1)*(b2/m2) > 0
+ +
- -
we don't know anything about b1 and b2, so we cannot determine the signs of m1 and m2 --> Insuff

Stmt 2)
b1*b2<0
+ -
- +
no info about the slopes --> Insuff

Stmt 1&2)
from statement 1 we know that (b1*b2)<0, and from statement 2 that (b1*b2)/(m1*m2)>0. If the numerator (b1*b2) is negative (stmt 2) and the whole equation is positive, then (m1*m2) must be negative. --> Sufficient
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Re: DS -GMAT Prep2 - coordinate geometry [#permalink] New post 29 Apr 2007, 10:51
(1) Both L and K intersect the X axis EITHER on x>0 OR on x<0>0 and K on y<0> the product of the slopes will be -ve always and thus the answer is C.

Last edited by Andr359 on 29 Apr 2007, 12:25, edited 6 times in total.
Re: DS -GMAT Prep2 - coordinate geometry   [#permalink] 29 Apr 2007, 10:51
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