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# given 3x+4y

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Senior Manager
Status: D-Day is on February 10th. and I am not stressed
Affiliations: American Management association, American Association of financial accountants
Joined: 12 Apr 2011
Posts: 275
Location: Kuwait
Schools: Columbia university
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Kudos [?]: 45 [0], given: 52

given 3x+4y [#permalink]  25 Nov 2011, 14:29
00:00

Difficulty:

5% (low)

Question Stats:

67% (01:21) correct 33% (00:00) wrong based on 12 sessions
Given 3x + 4y = 18, what is x?

(1) 5x + 2y = 16

(2) 3/2 x = 9 – 2y
[Reveal] Spoiler: OA

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Intern
Joined: 11 Nov 2011
Posts: 18
Followers: 0

Kudos [?]: 17 [1] , given: 4

Re: given 3x+4y [#permalink]  26 Nov 2011, 04:30
1
KUDOS
if you double both sides of equation 1. you get:
10x + 4y = 32
4y = 32 - 10x

substitute this into the main equation gives:
3x + (32 - 10x) = 18
-7x = -14
x = 2
SUFFICIENT

If you double both sides of equation 2. you get the original equation. This gives no additional information.
INSUFFICIENT.

therefore it is A.
Manager
Status: Meh, I can't take the GMAT before 2017.
Joined: 20 Aug 2011
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Kudos [?]: 65 [0], given: 0

Re: given 3x+4y [#permalink]  27 Nov 2011, 02:16
A

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Re: given 3x+4y   [#permalink] 27 Nov 2011, 02:16
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# given 3x+4y

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