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# ds - gmatprep - xy-plane

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Manager
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ds - gmatprep - xy-plane [#permalink]

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09 Sep 2007, 13:05
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ds
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VP
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Re: ds - gmatprep - xy-plane [#permalink]

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09 Sep 2007, 13:18
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
CEO
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Re: ds - gmatprep - xy-plane [#permalink]

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09 Sep 2007, 19:51
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...
Senior Manager
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09 Sep 2007, 22:14
Good question... need more of this kind.

Ans: C
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09 Sep 2007, 22:19
I go with B.
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10 Sep 2007, 03:17
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]

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10 Sep 2007, 04:16
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.

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...
Re: ds - gmatprep - xy-plane   [#permalink] 10 Sep 2007, 04:16
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