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# Given 3x + 4y = 18, what is x?

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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: 266
Location: Kuwait
Schools: Columbia university
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Given 3x + 4y = 18, what is x? [#permalink]

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25 Nov 2011, 15:29
00:00

Difficulty:

25% (medium)

Question Stats:

68% (01:49) correct 32% (00:19) wrong based on 38 sessions

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Given 3x + 4y = 18, what is x?

(1) 5x + 2y = 16

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

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Last edited by Bunuel on 08 May 2015, 08:54, edited 1 time in total.
Renamed the topic and edited the question.
Intern
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Re: Given 3x + 4y = 18, what is x? [#permalink]

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26 Nov 2011, 05:30
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.
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Re: Given 3x + 4y = 18, what is x? [#permalink]

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27 Nov 2011, 03:16
A

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Re: Given 3x + 4y = 18, what is x?   [#permalink] 27 Nov 2011, 03:16
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