how to make this equation true??

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hongwang9703
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Topic: how to make this equation true??
PostFri Nov 06, 2009 5:22 pm
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If |x| + |y| = -x - y and xy does not equal 0, which of the following must be true?

x + y > 0
x + y < 0
x - y > 0
x - y < 0
x2 - y2 > 0


|x| + |y| = -x - y im confused as what numbers satisfy this equation! plz assist!
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palvarez
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PostSat Nov 07, 2009 6:44 pm
Hey

I am seeing weird signs in ur question like –

Can you retype it, instead of cut n paste.
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xcusemeplz2009
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PostSat Nov 07, 2009 8:11 pm
imo d
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PostMon Nov 09, 2009 6:41 pm
IMO D

If X = -2 and Y = 2, then we will have
|-2| + |2| = -(-2) x 2
4 = 4

In choice D ... X x Y < 0 from abouve we also have (-2) x (2) < 0
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hongwang9703
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PostTue Nov 10, 2009 7:16 pm
opz sorry about that here is the question

|X|+|y| = - X - Y and xy does not equal 0, which of the following must be true?

x + y > 0
x + y < 0
x - y > 0
x - y < 0
x2 - y2 > 0
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