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Inequalities DS

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Milanproda
 Post subject: Inequalities DS
 Post Posted: Wed May 25, 2011 6:45 pm 
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Course Students


Posts: 48
Is x>y?

1- x-y>0

My question is: Can I safely add the y to the other side of the equation?

Also, if x=3 and y=2, then (3-2)>0

If x=2 and y=3, then (2-(-3))=5, which is greater than 0?

Please tell me where I am wrong,

Sorry for the trouble again,

Milan
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jnelson0612
 Post subject: Re: Inequalities DS
 Post Posted: Sat May 28, 2011 3:11 pm 
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ManhattanGMAT Staff


Posts: 1857
Milanproda wrote:
Is x>y?

1- x-y>0

My question is: Can I safely add the y to the other side of the equation?

Also, if x=3 and y=2, then (3-2)>0

If x=2 and y=3, then (2-(-3))=5, which is greater than 0?

Please tell me where I am wrong,

Sorry for the trouble again,

Milan


You can safely add y to the other side of the equation. Thus, statement 1 tells us that x>y.

You could not use x=2 and y=3 because these numbers do not conform to the information given in statement 1. Remember, since the statements are ALWAYS true, we can only use numbers that fit the statements.

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Jamie Nelson
ManhattanGMAT Instructor
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