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Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
If x - y = 5 and (x + 1)(y - 1) = 5, what is the value of xy?
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02 Jul 2022, 05:29
02 Jul 2022, 05:29
1
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Question Stats:
72% (01:22) correct
27% (01:28) wrong based on 11 sessions
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If x - y = 5 and (x + 1)(y - 1) = 5, what is the value of xy?
(A) -1
(B) 1
(C) 5
(D) 10
(E) 11
(A) -1
(B) 1
(C) 5
(D) 10
(E) 11
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: If x - y = 5 and (x + 1)(y - 1) = 5, what is the value of xy?
[#permalink]
04 Jul 2022, 06:33
04 Jul 2022, 06:33
2
GreenlightTestPrep wrote:
If x - y = 5 and (x + 1)(y - 1) = 5, what is the value of xy?
(A) -1
(B) 1
(C) 5
(D) 10
(E) 11
(A) -1
(B) 1
(C) 5
(D) 10
(E) 11
No takers??
Given: (x + 1)(y - 1) = 5
Expand and simplify the left side: xy - x + y - 1 = 5
Add 1 to both sides of the equation: xy - x + y = 6
Add x and subtract y from both sides: xy = 6 + x - y
Substitute: xy = 6 + 5
Simplify: xy = 11
Answer: E
Re: If x - y = 5 and (x + 1)(y - 1) = 5, what is the value of xy?
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13 Feb 2024, 15:23
13 Feb 2024, 15:23
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Thanks to another GRE Prep 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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