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ns
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GMATPrep: intersecting line 17 Jun 2006, 13:45
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Could someone please explain how do we get the right answer (OA later)

Thanks



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MA
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GMATPrep: intersecting line 17 Jun 2006, 14:43
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A.

from 1 the slopes of both lines are +ve.
from 2 the slopes of bother lines could be +ve or -ve.
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mrmikec
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GMATPrep: intersecting line 17 Jun 2006, 14:51
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MA
A.

from 1 the slopes of both lines are +ve.
from 2 the slopes of bother lines could be +ve or -ve.
Show more


I did it a different way and got a different answer. MA can you take a look and let me know. greatly appreciated. thanks.

I got C

C1. product of the two x-intercepts is positive

two cases:

line k = b/m = +ve
line l = b/m = +ve

line k = b/m = -ve
line l = b/m = -ve

so m can be either +ve for both m or -ve or one and +ve for the other

INSUFFICIENT

C2. product of the y-intercept is -ve

2 cases

line k -> b = +ve,
line l -> b = -ve

line k -> b = -ve
line l-> b = +ve

tells you nothing about the respective slopers

combined:

if line k's b/m = +ve and b = +ve then m = -ve
then line l ->b/m = +ve and b = -ve then m = +ve

product is negative

if line k's b/m = -ve and b = -ve then m = +ve
then line l -> b/m = +ve and b = +ve then m= -ve

product is -ve.
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MA
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GMATPrep: intersecting line 17 Jun 2006, 16:43
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mrmikec
MA
A.

from 1 the slopes of both lines are +ve.
from 2 the slopes of bother lines could be +ve or -ve.

I did it a different way and got a different answer. MA can you take a look and let me know. greatly appreciated. thanks.

I got C

C1. product of the two x-intercepts is positive

two cases:

line k = b/m = +ve
line l = b/m = +ve

line k = b/m = -ve
line l = b/m = -ve

so m can be either +ve for both m or -ve or one and +ve for the other

INSUFFICIENT

C2. product of the y-intercept is -ve

2 cases

line k -> b = +ve,
line l -> b = -ve

line k -> b = -ve
line l-> b = +ve

tells you nothing about the respective slopers

combined:

if line k's b/m = +ve and b = +ve then m = -ve
then line l ->b/m = +ve and b = -ve then m = +ve

product is negative

if line k's b/m = -ve and b = -ve then m = +ve
then line l -> b/m = +ve and b = +ve then m= -ve

product is -ve.
Show more


yah now i see my mistake. i didnot realize the downward lines. you are correct...



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!