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given 3x+4y

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Senior Manager
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Status: D-Day is on February 10th. and I am not stressed
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given 3x+4y [#permalink] New post 25 Nov 2011, 14:29
00:00
A
B
C
D
E

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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Re: given 3x+4y [#permalink] New post 26 Nov 2011, 04:30
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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 [#permalink] New post 27 Nov 2011, 02:16
A

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