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If x and y are integers, what is the value of x?

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If x and y are integers, what is the value of x?  [#permalink]

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New post 22 May 2016, 21:53
1
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A
B
C
D
E

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If \(x\) and \(y\) are integers, what is the value of \(x\)?

(1) \(xy = 1\)
(2) \(x\neq{-1}\)
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Re: If x and y are integers, what is the value of x?  [#permalink]

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New post 22 May 2016, 22:59
1
nalinnair wrote:
If \(x\) and \(y\) are integers, what is the value of \(x\)?

(1) \(xy = 1\)
(2) \(x\neq{-1}\)


We know that x and y are integers.

Statement 1: \(xy = 1\)
Case 1, x = 1 and y = 1
Case 2, x = - 1 and y = -1
INSUFFICIENT

Statement 2: \(x\neq{-1}\)
Nothing can be said about the value of x
INSUFFICIENT

Combining both statements:
We know that xy = 1 and x ≠ -1
Hence x = 1
SUFFICIENT

Correct Option: C
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Re: If x and y are integers, what is the value of x?  [#permalink]

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New post 20 Jan 2017, 08:49
nalinnair wrote:
If \(x\) and \(y\) are integers, what is the value of \(x\)?

(1) \(xy = 1\)
(2) \(x\neq{-1}\)




(1) x*y = 1 and (x, y) = integers
Since x,y are integers the only integer pair that gives 1 as a product should be (1, 1) or (-1, -1) . Although since we cannot decide which pair fits our case insufficient

(2) Actually here if you now only \(x\neq{-1}\)
This is quite easy as both x and y can have any value insufficient

(1) + (2) Give the right answer hence C
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Re: If x and y are integers, what is the value of x?  [#permalink]

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New post 23 Jan 2017, 08:40
x,y integers
value of x = ?
1, xy=1
(Negative)(Negative) = Positive
(Positive)(Positive) = Positive
x = -1 or x = 1
BCE
2, x # - 1
Eliminate B
Combine
x = 1, true
C
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Re: If x and y are integers, what is the value of x?  [#permalink]

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New post 02 Jun 2018, 03:30
Ans C
St 1 : xy=1 this gives 2 cases (1,1) &(-1,-1). ambiguous and hence INSUFFICIENT.
St 2: x not equal -1 ....pick any integer except that... INSUFFICIENT.

Together : well together st 2 will diminish the ambiguity in st 1 and will lead to only one choice as x=1. Hence SUFFICIENT
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Re: If x and y are integers, what is the value of x?  [#permalink]

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New post 19 Oct 2018, 09:19
nalinnair wrote:
If \(x\) and \(y\) are integers, what is the value of \(x\)?

(1) \(xy = 1\)
(2) \(x\neq{-1}\)


Statement 1) tells us x and y must be of the same sign (-1)(-1) or (1) (1) so we cannot tell if x = 1 or -1.

Insufficient.

Eliminate A/D

Try statement 2) it tells us x cannot be -1

well then x can be anything else? so it is insufficient.

Eliminate B

now try combining statement (1) and (2)

we get that x cannot be -1 then x must be 1.

Sufficient.

answer choice C
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Re: If x and y are integers, what is the value of x?  [#permalink]

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New post 22 Oct 2018, 12:58
nalinnair wrote:
If \(x\) and \(y\) are integers, what is the value of \(x\)?

(1) \(xy = 1\)
(2) \(x\neq{-1}\)


Given,

x and y are integers.

Statement 1:

xy = 1

x = 1

y = 1

or

x = -1

y = -1

So, we don't have the specific value for x.

NOT sufficient.

Statement 2:

x is not equal to -1.

infinite values for x except -1.

NOT sufficient.

Combining both statements;

Now we know from 1 that x is either 1 or -1. statement 2 helps to +1.

The best answer is C.
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Re: If x and y are integers, what is the value of x?   [#permalink] 22 Oct 2018, 12:58
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If x and y are integers, what is the value of x?

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