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15 Jun 2020, 16:49
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
18% (01:40) correct
82%
(02:15)
wrong
based on 11
sessions
History
Date
Time
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Not Attempted Yet
Is x = 3?
(1) x =(−3y − 3)/ (1− y)
(2) (|x|/ x) + x |x| > 0
(1) x =(−3y − 3)/ (1− y)
(2) (|x|/ x) + x |x| > 0
Archived Topic
Hi there,
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KhulanE
15 Jun 2020, 17:17
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can someone pls explain this equation?
i cannot reach the right answer.
i cannot reach the right answer.
15 Jun 2020, 18:21
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KhulanE
To be honest, I don't understand the following solution, but this is what is given in the book:
Statement (1): Suppose x = 3.
Then 3 =(−3y − 3)/ (1− y),
or 3(1 – y) = –3y – 3,
or 3 – 3 y = –3 y – 3,
or 3 = –3. But this is impossible.
Hence, Statement (1) alone is sufficient and says that “No, x is not 3.”
Statement (2):
(|x|/x) + |x| x > 0 .
Suppose x = 3.
Then 3/3+ 3x3 > 0 ,
or 1 + 9 = 10 > 0.
This doesn’t prevent x being equal to 3, nor does it support it.
So, Statement (2) alone is not sufficient.
The answer is (A).
