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If x and y are integers and 3^(x-4) = 3^(y+2), what is y in

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If x and y are integers and 3^(x-4) = 3^(y+2), what is y in [#permalink]

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New post 06 Jun 2012, 19:16
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If x and y are integers and 3^(x-4) = 3^(y+2), what is y in terms of x?

A. x - 6
B. x - 5
C. x - 2
D. x + 2
E. x + 6
[Reveal] Spoiler: OA

Last edited by Bunuel on 07 Jun 2012, 12:19, edited 1 time in total.
Edited the question

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Re: Powerprep: y in terms of x [#permalink]

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New post 06 Jun 2012, 19:26
jsphcal wrote:
If x and y are integers and 3^x-^4 = 3^y+^2, what is y in terms of x?

A x - 6
B x - 5
C x - 2
D x + 2
E x + 6


Wait, how do you write down 3^y+^2 ?

Can you use parentheses so it'll be easier to understand.

Thanks
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Re: Powerprep: y in terms of x [#permalink]

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New post 06 Jun 2012, 19:27
jsphcal wrote:
If x and y are integers and 3^x-^4 = 3^y+^2, what is y in terms of x?

A x - 6
B x - 5
C x - 2
D x + 2
E x + 6



since the bases are both 3 if i just isolate the exponents

x-4 = y+2 i can add 4 to get x = y+6

so x = y+6

since the question asks what is y in terms of x i can just subtract 6 from right side

so x-6 = y


I didnt take my time and when i attempted in powerprep, no i can see the answer is straight forward

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Re: Powerprep: y in terms of x [#permalink]

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New post 07 Jun 2012, 03:06
jsphcal wrote:
If x and y are integers and 3^x-^4 = 3^y+^2, what is y in terms of x?

A x - 6
B x - 5
C x - 2
D x + 2
E x + 6



The question seems confusing

is it 3^(x-4) = 3^(y+2)

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Re: If x and y are integers and 3^(x-4) = 3^(y+2), what is y in [#permalink]

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New post 07 Jun 2012, 12:21
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Re: If x and y are integers and 3^(x-4) = 3^(y+2), what is y in [#permalink]

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New post 17 Jun 2012, 12:55
Answer: A

3^(x-4) = 3^(y+2)

Since the base is the same, I isolated the equations and solved for y.

x-4 = y+2
y=x-6

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Re: If x and y are integers and 3^(x-4) = 3^(y+2), what is y in [#permalink]

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Re: If x and y are integers and 3^(x-4) = 3^(y+2), what is y in [#permalink]

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New post 01 Aug 2017, 17:12
jsphcal wrote:
If x and y are integers and 3^(x-4) = 3^(y+2), what is y in terms of x?

A. x - 6
B. x - 5
C. x - 2
D. x + 2
E. x + 6


Since both bases are the same, we can drop the bases and equate the exponents:

x - 4 = y + 2

x - 6 = y

Answer: A
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Kudos [?]: 837 [0], given: 5

Re: If x and y are integers and 3^(x-4) = 3^(y+2), what is y in   [#permalink] 01 Aug 2017, 17:12
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