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In the system of equations above, what is the value of x?

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Manager
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Joined: 30 May 2008
Posts: 76
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Kudos [?]: 6 [0], given: 26

In the system of equations above, what is the value of x? [#permalink] New post 13 May 2012, 12:04
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

75% (01:22) correct 25% (00:04) wrong based on 12 sessions
2x + 2y = -4
4x + y = 1

In the system of equations above, what is the value of x?

A. -3
B. -1
C. 2/5
D. 1
E. 1 3/4

[Reveal] Spoiler:
OA is D

Here is how I solved it, but didn't arrive at any of the above answer choice:

2x + 2y = -4 => x + y = -2
4x + y = 1

Subtract one equation from the other, get x = 1/3
[Reveal] Spoiler: OA
Manager
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Joined: 26 Feb 2012
Posts: 206
Concentration: Finance, Technology
GPA: 3.3
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Kudos [?]: 18 [0], given: 11

GMAT Tests User
Re: In the system of equations above, what is the value of x? [#permalink] New post 13 May 2012, 12:18
answer is D

so u have
x + y = -2 and
4x + y= 1

Subtract the second from the first

(x-4x) + (y-y) = (-2-1)
-3x = -3
x = 1
Re: In the system of equations above, what is the value of x?   [#permalink] 13 May 2012, 12:18
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