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Does x = 3?

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Math Expert
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Joined: 02 Sep 2009
Posts: 53020
Does x = 3?  [#permalink]

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New post 02 Sep 2016, 05:00
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

59% (00:49) correct 41% (01:17) wrong based on 90 sessions

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Joined: 03 Jul 2016
Posts: 74
Re: Does x = 3?  [#permalink]

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New post 02 Sep 2016, 05:09
Statement 1: (x-3) (y-1) =0 => x can be 3 or y can be 1. NOT SUFFICIENT.

Statement 2: (x-3)^2+ (y-1)^2 =0. This can be 0 only if both x =3 and y=1. SUFFICIENT.

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Re: Does x = 3?  [#permalink]

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New post 02 Sep 2016, 05:50
Does X = 3 ?

A: (x-3)(y-1) = 0.

This is will be true when x = 3 or y = 1 or x=3 and y=1.

So, we cannot be sure if x= 3 is always true . A is INSUFFICIENT

B: (x-3)^2 + (y-1)^2 = 0

A square is always positive. So, (x-3)^2 and (y-1)^2 is always positive.

So, B to be ZERO, both (x-3)^2 and (y-1)^2 should be ZERO.

so, x = 3. B is SUFFICIENT.
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Re: Does x = 3?  [#permalink]

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New post 31 Jan 2019, 10:21
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: Does x = 3?   [#permalink] 31 Jan 2019, 10:21
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