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28 May 2017, 02:44
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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:
25%
(medium)
Question Stats:
75% (01:16) correct
25%
(01:29)
wrong
based on 48
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What is the value of x – y?
(1) x + y = 3y – x
(2) x + y = x^3 + y^3
(1) x + y = 3y – x
(2) x + y = x^3 + y^3
Source: Nova GMAT
Difficulty Level: 600
Difficulty Level: 600
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28 May 2017, 02:55
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(1) is sufficient since multiple values of (x,y) like (0,0), (1,1), (-1,-1) satisfy the equation and yield same result for x-y which is 0
(2) is also sufficient since same set of values satisfy the equation and yield same result for x-y
hence (D)
please correct me if i am wrong
Sent from my iPhone using GMAT Club Forum
(2) is also sufficient since same set of values satisfy the equation and yield same result for x-y
hence (D)
please correct me if i am wrong
Sent from my iPhone using GMAT Club Forum
(1) x + y = 3y – x
Rewriting this equation, we get x=y.
Whatever the value of x and y, x-y is always 0.Hence sufficient.
(2) x + y = x^3 + y^3
This is possible when both x and y are 1 and if x=1 and y = -1.
Adding both these values will not yield an unique answer.
Hence insufficient. (Option A)
Rewriting this equation, we get x=y.
Whatever the value of x and y, x-y is always 0.Hence sufficient.
(2) x + y = x^3 + y^3
This is possible when both x and y are 1 and if x=1 and y = -1.
Adding both these values will not yield an unique answer.
Hence insufficient. (Option A)
