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For integers, x and y, x=y+2. From the table below

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Senior Manager
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Joined: 21 Oct 2013
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Kudos [?]: 646 [0], given: 289

For integers, x and y, x=y+2. From the table below [#permalink] New post 06 Jul 2014, 04:45
For integers, x and y, x=y+2. From the table below, select the values that could correspond to x and x^2 − y^2.

x x^2−y^2
21
23
25
36
40
49

OE
[Reveal] Spoiler:
x = (y + 2) → (x – y) = 2
(x^2 – y^2) = (x – y)(x + y) = 2(x + y) → must be even 40 or 36


OA
[Reveal] Spoiler:
x = 21
(x^2 – y^2) = 40


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Last edited by goodyear2013 on 08 Jul 2014, 05:03, edited 1 time in total.
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Senior Manager
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Kudos [?]: 9 [0], given: 27

Re: For integers, x and y, x=y+2. From the table below [#permalink] New post 08 Jul 2014, 00:42
wrong answer,

x^2-Y^2= 4x-4

to find x and 4x- 4 we can not have a and e.
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Re: For integers, x and y, x=y+2. From the table below   [#permalink] 08 Jul 2014, 00:42
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For integers, x and y, x=y+2. From the table below

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