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DS: Need help explaining OA

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by sportcntr3 » Wed Jun 10, 2009 5:24 am
Is xy>0

(1) x-y>-2
(2) x-2y<-6

OA C

I'm not sure how to solve this problem, please help with an explanation. Thanks
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Source: — Data Sufficiency |
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by tohellandback » Wed Jun 10, 2009 6:00 am
C because

1)x-y>-2
2)x-2y<-6
or 2y-x>6
add this with 1
y>4 so least value of y is 4
put this in 1
x>y-2
x must be >2
so both are positive
so xy>0
The powers of two are bloody impolite!!
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by sportcntr3 » Wed Jun 10, 2009 6:10 am
Got it thanks. Was unsure if you could add with inequalities
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by tohellandback » Wed Jun 10, 2009 6:15 am
oh yes you can..jus be careful of the signs..they screw up big time!!!
The powers of two are bloody impolite!!
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