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Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
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by Mumbai » Fri Jul 01, 2011 1:39 am
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Junior | Next Rank: 30 Posts
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by testprepDublin » Fri Jul 01, 2011 6:22 am
If (-a , b) and (-b , a) are in the same quadrant and if a a & b are non-zero then a and b must have the same sign. As -a is in the same quadrant as -b and a is in the same quadrant as b.

So if (-x,y) is to be same quadrant x and y must have the same sign as each other and as a and b.

(1) same as each other
insufficient

(2) x same as a and b
insufficient

(1)&(2) x and y same as a and b
sufficient
Deirdre at testprepdublin.com
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by sunilrawat » Fri Jul 01, 2011 11:17 pm
My approach,

a. xy>0
either x and y are both positive, or both negative.
(-x,y) could be either in I or II quadrant.
not sufficient.

b. ax>0
'a' being a constant, x>0
no info about y. not sufficient.

combining the two,
x>0 means y>0
(-x,y) lies in the same quadrant.
sufficient.

OA C
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