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x^2 - 1 = y and x = 3
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09 May 2015, 10:33
09 May 2015, 10:33
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Question Stats:
89% (00:19) correct
10% (00:24) wrong based on 64 sessions
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\(x^2-1=y\) and \(x=3\)
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Quantity A |
Quantity B |
\(y^2\) |
\(80\) |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: GRE Math Challenge #73- x^2 - 1 = y and x = 3
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08 Aug 2017, 07:13
08 Aug 2017, 07:13
sandy wrote:
\(x^2 - 1 = y\)
\(x = 3\)
Quantity A: y²
Quantity B: 80
• Quantity A is greater.
• Quantity B is greater.
• Both Quantities are Equal
• Cannot be determined
\(x = 3\)
Quantity A: y²
Quantity B: 80
• Quantity A is greater.
• Quantity B is greater.
• Both Quantities are Equal
• Cannot be determined
Given:
x² - 1 = y
x = 3
So, in the top equation, REPLACE x with 3 to get: 3² - 1 = y
Evaluate to get: 9 - 1 = y
So, y = 8
We must compare...
Quantity A: y²
Quantity B: 80
Replace y with 8 to get:
Quantity A: 8²
Quantity B: 80
Evaluate to get:
Quantity A: 64
Quantity B: 80
Answer:
Show: ::
B
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gmatclubot
Re: GRE Math Challenge #73- x^2 - 1 = y and x = 3 [#permalink]
08 Aug 2017, 07:13
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