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Is the product of their slopes negative

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Source: — Data Sufficiency |
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by Gurpinder » Tue Sep 07, 2010 1:32 pm
(1) x intercepts are either positive or both negative

(2) same as (1) alone.

Together:

we know that the slope of both lines carry the same sign. therefore, the product cannot be negative.

(C).
"Do not confuse motion and progress. A rocking horse keeps moving but does not make any progress."
- Alfred A. Montapert, Philosopher.
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