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What is the value of xy ? (1) y – 1 = x (2) x^2 + x – 6 = 0

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Joined: 02 Sep 2009
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What is the value of xy ? (1) y – 1 = x (2) x^2 + x – 6 = 0  [#permalink]

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New post 12 Sep 2017, 05:05
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

60% (01:06) correct 40% (01:07) wrong based on 48 sessions

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Joined: 02 Nov 2015
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GMAT 1: 640 Q49 V29
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Re: What is the value of xy ? (1) y – 1 = x (2) x^2 + x – 6 = 0  [#permalink]

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New post 12 Sep 2017, 07:17
It's a C.

Statement 1: Give no additional information.. not sufficient.

Statement 2: x= 2 and -3.
Not sufficient.
Statement 1 and 2 together:

Sufficient. It. Gives a value of 6 when solved.


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Re: What is the value of xy ? (1) y – 1 = x (2) x^2 + x – 6 = 0  [#permalink]

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New post 16 Apr 2018, 08:56
Statement 1 : y-1=x, y=x+1, xy=x(x+1)-- no solution
Statement 2: Solve the quadratic equation and we get x= 2, -3
If x=2, y=3 (With help from Statement 1), then xy =3x2= 6
If x=-3, y=-2 (With help from Statement 1), then xy =-3 x -2= 6.
Answer is C- BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
Re: What is the value of xy ? (1) y – 1 = x (2) x^2 + x – 6 = 0 &nbs [#permalink] 16 Apr 2018, 08:56
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