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# If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?

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Math Expert
Joined: 02 Sep 2009
Posts: 50001
If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?  [#permalink]

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11 Dec 2015, 09:17
00:00

Difficulty:

5% (low)

Question Stats:

85% (00:58) correct 15% (02:14) wrong based on 74 sessions

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If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?

A. 1/7
B. 3
C. 15
D. 52/7
E. 60/7

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Concentration: Strategy, General Management
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Re: If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?  [#permalink]

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11 Dec 2015, 10:12
2
4x + y = 8
−3x + y = 7
Adding both the equations --> x + 2y = 15

Senior Manager
Joined: 28 Feb 2014
Posts: 294
Location: United States
Concentration: Strategy, General Management
Re: If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?  [#permalink]

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12 Dec 2015, 17:14
4x + y = 8
−3x + y = 7
x + 2y = 15

C. 15
Intern
Joined: 27 Oct 2015
Posts: 26
Re: If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?  [#permalink]

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12 Dec 2015, 18:20
Adding both the equations, we get x + 2y = 15
Director
Joined: 24 Nov 2015
Posts: 522
Location: United States (LA)
Re: If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?  [#permalink]

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25 Apr 2016, 13:21
4x+y=8 ...equation 1
-3x+y=7 ...equation 2
adding both the equations
x+2y=15
correct answer option C
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Re: If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?  [#permalink]

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23 May 2017, 06:59
add 2 equations and you will get x+2y = 8+7=15
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Re: If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y? &nbs [#permalink] 23 May 2017, 06:59
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# If 4x + y = 8 and y − 3x = 7, then what is the value of x + 2y?

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