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09 Sep 2007, 14:05
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09 Sep 2007, 14:18
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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
09 Sep 2007, 20:51
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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...
