If x + 2y + 1 = y - x, what is the value of x? : GMAT Data Sufficiency (DS)
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# If x + 2y + 1 = y - x, what is the value of x?

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If x + 2y + 1 = y - x, what is the value of x? [#permalink]

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06 Feb 2012, 07:33
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If x + 2y + 1 = y - x, what is the value of x?

1) y² = 9
2) y = 3
[Reveal] Spoiler: OA

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Re: If x + 2y + 1 = y - x, what is the value of x? [#permalink]

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06 Feb 2012, 07:37
If x + 2y + 1 = y - x, what is the value of x?

To find x we need the unique value of y.

(1) y^2 = 9 --> y=3 or y=-3. not sufficient.
(2) y = 3. Sufficient.

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Re: If x + 2y + 1 = y - x, what is the value of x? [#permalink]

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11 Feb 2012, 07:13
fiendex wrote:
If x + 2y + 1 = y - x, what is the value of x?

1) y² = 9
2) y = 3

1) y² = 9 so y = +3 or -3 and both values generate different answer for the value of x, hence insufficient, A and D gone
2) y=3 so this will give us only single value of x, remember solving for the value of x is not required, we know seeing x + 2y + 1 = y - x that if we know y , we will get the value of x...
IMO B
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Re: If x + 2y + 1 = y - x, what is the value of x? [#permalink]

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11 Feb 2012, 07:39
B - y could be 3 or -3 in statement 1
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Re: If x + 2y + 1 = y - x, what is the value of x? [#permalink]

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19 Sep 2013, 09:35
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Re: If x + 2y + 1 = y - x, what is the value of x? [#permalink]

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17 Sep 2016, 05:16
B is correct. Here's why:

(1) y^2 = +/- 3

INSUFFICIENT - we need a single value for y in order to solve for a single value of x

(2) y = 3

=x+6+1 = 3-x
=x+7 = 3-x
=2x = -4 --> x = -2

SUFFICIENT
Re: If x + 2y + 1 = y - x, what is the value of x?   [#permalink] 17 Sep 2016, 05:16
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