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# What is the value of x? (1) (x + y) = x - y (2) x + y = 2 I

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Manager
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What is the value of x? (1) (x + y) = x - y (2) x + y = 2 I [#permalink]

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25 Apr 2006, 17:21
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What is the value of x?
(1) â€“ (x + y) = x - y
(2) x + y = 2

I picked E, but it's A. How does (1) give you a value?

-x-y = x-y ---> -x = x ... then what?
Manager
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25 Apr 2006, 18:00
meaning, the only way a number, n, could equal the negative of itself is for n to equal 0. got it.
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25 Apr 2006, 19:05
St1:
-x-y = x-y
-2x = 0
x = 0
Sufficient.

St2:
x+y=2
Many ways to get here: 1+1, 2-1, 3-2 etc... Insufficient.

Manager
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25 Apr 2006, 19:10
got A as well
25 Apr 2006, 19:10
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