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# if (x-5)(y+2) = 0, which of the following must be true?

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Intern
Joined: 31 Jul 2003
Posts: 9
Location: CT
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if (x-5)(y+2) = 0, which of the following must be true?  [#permalink]  17 Jan 2004, 22:05
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100% (01:01) correct 0% (00:00) wrong based on 2 sessions
if (x-5)(y+2) = 0, which of the following must be true?

a. x=y
b. x>y
c. x<y
d. xy=-10
e. none of the above
Manager
Joined: 26 Dec 2003
Posts: 227
Location: India
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Kudos [?]: 2 [0], given: 0

B? X>Y if x=5 or if y= -2 the euation will be 0 so x has to be greater than y
Intern
Joined: 01 Dec 2003
Posts: 35
Location: infront of my LCD
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E?

(x-5)(y+2) = 0

if x = 5, y can be anything and it will be zero
if y = -2, x can be anything and it will be zero
Intern
Joined: 05 Dec 2003
Posts: 47
Location: LA
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I agree with calnhob's answer and approach. In questions like these, I never go for the obvious which is setting x = 5 and y = -2. There's always a trick, unless it's the first question in the test.

My approach. First, identify what they are testing you. In an equation like this when is it equal to 0. When either set of ( ) is equal to 0 or when x=5 and y =-2. Then using that information, you move on.

I have learned through practice, never to dive into the question. First ask yourself, what is the GMAT testing, then write down either the formula or the rule. I'm not an expert in math, but it works for me.
Intern
Joined: 20 Jan 2004
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I also vote for E.

The calnhob way of thinking is the most appropriate here.
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