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If y = 2(x+1) what is the value of x + y?

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Math Expert
Joined: 02 Sep 2009
Posts: 51229
If y = 2(x+1) what is the value of x + y?  [#permalink]

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14 Apr 2015, 03:48
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Difficulty:

55% (hard)

Question Stats:

66% (02:07) correct 34% (01:51) wrong based on 101 sessions

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If y = 2(x+1) what is the value of x + y?

(1) x + (6/y) = 3
(2) y = x + 2

Kudos for a correct solution.

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Status: On a mountain of skulls, in the castle of pain, I sit on a throne of blood.
Joined: 30 Jul 2013
Posts: 327
Re: If y = 2(x+1) what is the value of x + y?  [#permalink]

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14 Apr 2015, 04:00
Bunuel wrote:
If y = 2(x+1) what is the value of x + y?

(1) x + (6/y) = 3
(2) y = x + 2

Kudos for a correct solution.

y=2x+2
x+y=3x+2=?

1. xy+6=3y
2 Unknowns
Not Sufficient

2. y=x+2
2x+2=x+2
x=0
y=2
x+y=0+2=2

Sufficient

Director
Joined: 21 May 2013
Posts: 652
Re: If y = 2(x+1) what is the value of x + y?  [#permalink]

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14 Apr 2015, 08:29
Bunuel wrote:
If y = 2(x+1) what is the value of x + y?

(1) x + (6/y) = 3
(2) y = x + 2

Kudos for a correct solution.

1. Put y=2x+2
x+6/2x+2=3
Solving for x, x=0 or x=2. Therefore, we will get two values of y and two values fo x+y. Insuffcient.

2.Put y=2x+2
2x+2=x+2
x=0
y=2
x+y=2 Sufficient
Manager
Joined: 01 Jan 2015
Posts: 56
Re: If y = 2(x+1) what is the value of x + y?  [#permalink]

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14 Apr 2015, 09:09
St 1 Solving the equation we get 2(X^2)-4X=0
Which gives us two values of x, x=2 or x = 0 -> NS
St 2 Solving the equation we get x=0 and y = 2 ; x+y = 2 S

Ans B
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Joined: 09 Sep 2013
Posts: 9184
Re: If y = 2(x+1) what is the value of x + y?  [#permalink]

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09 Oct 2017, 12:48
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If y = 2(x+1) what is the value of x + y? &nbs [#permalink] 09 Oct 2017, 12:48
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