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If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =

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Math Expert
Joined: 02 Sep 2009
Posts: 53066
If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =  [#permalink]

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18 Oct 2018, 00:32
00:00

Difficulty:

15% (low)

Question Stats:

86% (01:56) correct 14% (00:59) wrong based on 33 sessions

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If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =

A. -4
B. 4
C. 8
D. 16
E. 20

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Re: If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =  [#permalink]

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18 Oct 2018, 01:08
$$Given:$$ 5x - 3y = 7 -> (1) | 2y - 4x = 3 -> (2)

If we sum up the two equations (1) and (2), we will get x - y = 10

Therfore, the value of 2x - 2x = 2(x-y) = 2*10 = 20(Option E)
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Re: If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =   [#permalink] 18 Oct 2018, 01:08
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