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ds - gmatprep - xy-plane

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Piter
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ds - gmatprep - xy-plane [#permalink] New post   09 Sep 2007, 14:05
00:00
A
B
C
D
E

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(N/A)

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ds



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bkk145
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Re: ds - gmatprep - xy-plane [#permalink] New post   09 Sep 2007, 14:18
Piter wrote:
ds


C.

(1) The point (a,b) can be at quadrant II and IV, and this means that b is either positive or negative. INSUFFICIENT

(2) a<b doesn't tell us much. This can basically be true for all quadrants. INSUFFICIENT.

Together, you know that (a,b) is in quadrant II and IV. In IV, b is negative and a is positive. Since b>a, this means that it cannot be in quadrant IV. This leaves us with only quadrant II. In quadrant II, a is always negative, b is always positive.

SUFFICIENT
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Re: ds - gmatprep - xy-plane [#permalink] New post   09 Sep 2007, 20:51
Piter wrote:
ds


S1:
slope of line k is negative. So the slope can be -a/b or a/-b.

Insuff.


S2: a<b

Doesnt help us. too many options for a and b.

Together.

since S1 says that a or b must be negative and S2 says a<b. a must be the negative number. So b is positive.

C.


Much better than the XY plane Q i got on my GMATPrep...
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Re: ds - gmatprep - xy-plane [#permalink] New post   09 Sep 2007, 23:14
Good question... need more of this kind.

Ans: C
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Re: ds - gmatprep - xy-plane [#permalink] New post   09 Sep 2007, 23:19
I go with B.
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Re: ds - gmatprep - xy-plane [#permalink] New post   10 Sep 2007, 04:17
ywilfred wrote:
I go with B.


It could be in III quadrant where A could be less than B but at the same time B<0.

So I think C is correct
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Re: ds - gmatprep - xy-plane [#permalink] New post   10 Sep 2007, 05:16
The slope will be b/a
The line passes through the origin. It will have value of -x, y in quadrant II and x, -y in quadrant IV.
Combining the two statements, it can be deduced that the point a,b is in quadrant II.
The answer is C.

Regards.
GMATBLACKBELT wrote:
Piter wrote:
ds


S1:
slope of line k is negative. So the slope can be -a/b or a/-b.

Insuff.


S2: a<b

Doesnt help us. too many options for a and b.

Together.

since S1 says that a or b must be negative and S2 says a<b. a must be the negative number. So b is positive.

C.


Much better than the XY plane Q i got on my GMATPrep...




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 Data Sufficiency (DS) 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!
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Re: ds - gmatprep - xy-plane [#permalink]
10 Sep 2007, 05:16
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