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25 Sep 2017, 23:56
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
44% (01:10) correct
56%
(01:26)
wrong
based on 32
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of x?
(1) x^2 – y^2 = 0
(2) x/y + y/x = 0
(1) x^2 – y^2 = 0
(2) x/y + y/x = 0
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26 Sep 2017, 00:11
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Bunuel
Statement 1: \((x-y)(x+y)=0\), so either \(x-y=0\) or \(x+y=0\), in either case we have two variables and one equation. hence insufficient
Statement 2: Solve it to get \(\frac{(x^2+y^2)}{xy}=0\)
or \(x^2+y^2 = 0\). Sum of two positive numbers is 0 only when both the numbers are 0
Hence \(x=0\). Sufficient
Option B
26 Sep 2017, 00:19
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(1) x^2 – y^2 = 0
x^2 = y^2 , but this is not enough to answer
the question to what is the value of x(Insufficient)
(2) x/y + y/x = 0
This equation can be re-written as x^2 + y^2=0
This is only when possible when x=y=0 (Sufficient)(Option B)
x^2 = y^2 , but this is not enough to answer
the question to what is the value of x(Insufficient)
(2) x/y + y/x = 0
This equation can be re-written as x^2 + y^2=0
This is only when possible when x=y=0 (Sufficient)(Option B)
