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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] New post 25 Apr 2006, 16:21
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What is the value of x?
(1) – (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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 [#permalink] New post 25 Apr 2006, 17:00
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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 [#permalink] New post 25 Apr 2006, 18:05
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.

Answer is A
Manager
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 [#permalink] New post 25 Apr 2006, 18:10
got A as well :wink:
  [#permalink] 25 Apr 2006, 18:10
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What is the value of x? (1) (x + y) = x - y (2) x + y = 2 I

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