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

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Manager
Manager
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Joined: 04 Feb 2011
Posts: 64
Location: US
Followers: 2

Kudos [?]: 37 [0], given: 42

What is the value of x? (1) (x + y) = x - y (2) x + y = 2 [#permalink] New post 05 Mar 2011, 05:00
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

76% (01:26) correct 24% (00:31) wrong based on 57 sessions
What is the value of x?
(1) – (x + y) = x - y
(2) x + y = 2
1 KUDOS received
Math Forum Moderator
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Joined: 20 Dec 2010
Posts: 2028
Followers: 140

Kudos [?]: 1180 [1] , given: 376

Re: d/s variables [#permalink] New post 05 Mar 2011, 05:11
1
This post received
KUDOS
1.
– (x + y) = x - y
-x-y=x-y
-x=x
-2x=0
x=0;
Sufficient.

2. x+y=2
x=2-y.
y unknown. x can't be found.
Not sufficient.

Ans: "A"
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Director
Director
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Joined: 01 Feb 2011
Posts: 760
Followers: 14

Kudos [?]: 74 [0], given: 42

Re: d/s variables [#permalink] New post 06 Mar 2011, 12:23
1.

-x-y = x-y => x=0

One might think , huh two unknowns one equation , how are we gonna find value of x. On calculation ,we can see x =0.

Sufficient

2. y is needed to solve this one.
Not sufficient.


Hence the answer is A.
Re: d/s variables   [#permalink] 06 Mar 2011, 12:23
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What is the value of x? (1) (x + y) = x - y (2) x + y = 2

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