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If -3x+4y=28 and 3x-2y=8, what is the product of x and y?

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If -3x+4y=28 and 3x-2y=8, what is the product of x and y?  [#permalink]

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New post 14 Jul 2016, 00:47
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

82% (01:53) correct 18% (02:33) wrong based on 86 sessions

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Re: If -3x+4y=28 and 3x-2y=8, what is the product of x and y?  [#permalink]

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New post 14 Jul 2016, 01:30
1
Bunuel wrote:
If -3x+4y=28 and 3x-2y=8, what is the product of x and y?

A. 264.
B. 428.
C. 464.
D. 622.
E. 642.


Given -3x+4y=28 ---Eq 1
3x -2y =8 -- Eq 2

Sum both eqns we get 2Y = 36 => Y = 18

Sub 2Y in eq 2 => 3X - 36 = 8.
=> X = 44/3

Now XY = 44/3 * 18 = 264.

Option A is correct answer.
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Re: If -3x+4y=28 and 3x-2y=8, what is the product of x and y?  [#permalink]

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New post 14 Jul 2016, 03:47
Bunuel wrote:
If -3x+4y=28 and 3x-2y=8, what is the product of x and y?

A. 264.
B. 428.
C. 464.
D. 622.
E. 642.


-3x+4y=28
3x-2y=8

Adding both equations
2y= 36
y=18

Substituting 2y= 36 in any of the equations we get x= 44/3

44/3 *18= 44*6= 264

A is the answer
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Re: If -3x+4y=28 and 3x-2y=8, what is the product of x and y?  [#permalink]

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New post 15 Oct 2017, 09:12
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Re: If -3x+4y=28 and 3x-2y=8, what is the product of x and y? &nbs [#permalink] 15 Oct 2017, 09:12
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