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# ds - gmatprep - xy-plane

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Manager
Joined: 09 Dec 2006
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ds - gmatprep - xy-plane [#permalink]

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09 Sep 2007, 14:05
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ds
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VP
Joined: 10 Jun 2007
Posts: 1436

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Re: ds - gmatprep - xy-plane [#permalink]

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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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CEO
Joined: 29 Mar 2007
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Re: ds - gmatprep - xy-plane [#permalink]

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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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Senior Manager
Joined: 27 Aug 2007
Posts: 253

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09 Sep 2007, 23:14
Good question... need more of this kind.

Ans: C

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GMAT Club Legend
Joined: 07 Jul 2004
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09 Sep 2007, 23:19
I go with B.
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VP
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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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Manager
Status: Post MBA, working in the area of Development Finance
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Re: ds - gmatprep - xy-plane [#permalink]

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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...

Kudos [?]: 3 [0], given: 1

Re: ds - gmatprep - xy-plane   [#permalink] 10 Sep 2007, 05:16
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# ds - gmatprep - xy-plane

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