GMATPrep - XY co-ordinate plane DS question : DS Archive
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# GMATPrep - XY co-ordinate plane DS question

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GMATPrep - XY co-ordinate plane DS question [#permalink]

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08 Oct 2006, 05:37
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GMATPrep - XY co-ordinate plane DS question
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GMATPrep-DS-Q9.doc [70.5 KiB]

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08 Oct 2006, 10:42
Hey cicerone,

Can you please provide some insights as to how to solve this Q?

OA is C as you mentioned
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15 Oct 2006, 12:04
I got C as well and here's what I did.

Slope formula is Y1-Y2/X1-X2

1) We are given that the product of the two point's x coordinates is positive. This doesn't tell us much because the two y coordinates could be positive yielding a positive slope or the two y coordinates could be negative yielding a negative slope.

2) Here we are given that the product of the y coordinates are negative. But again this doesn't tell us whether the x coordinates are positive or negative which could yield either a positive or negative slope.

3) Together we know that the X coordinates are positive and the Y coordinates are negative. Hence we can determine that the slope is indeed negative.

15 Oct 2006, 12:04
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