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DS gmat prep

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DS gmat prep [#permalink] New post 06 Aug 2007, 06:26
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please solve this
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 [#permalink] New post 06 Aug 2007, 06:39
Ans: C

Sentence 1 tells us that they must intersect X-Axis right of Y-Axis.
Sentence 2 tells us that one of them has to intersect Y-Axis below X-Axis while the other above.

And since they're both intersecting at point (4, 3), one has to slope downwards while the other upwards. This will make the product of their slopes negative.
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Re: DS gmat prep [#permalink] New post 06 Aug 2007, 09:32
(1) Either both lines intersect the +x axis or the -x axis. Insuff.

(2) One of them intersects the +y axis and the other one the -y axis. Insuff.

(1&2) The only feasible configuration is: one line intersects the +x axis and the +y axis (and has a positive slope), and the other line the +x axis and the -y axis (and has a negative slope). Therefore, the product of their slopes is negative. Suff. C.
Re: DS gmat prep   [#permalink] 06 Aug 2007, 09:32
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