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# If 5^x 5^x - 3 = (124)(5^y), what is y in terms of x? A. x

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Intern
Joined: 08 Nov 2008
Posts: 29
If 5^x 5^x - 3 = (124)(5^y), what is y in terms of x? A. x [#permalink]

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11 Nov 2008, 14:37
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If 5^x – 5^x - 3 = (124)(5^y), what is y in terms of x?

A. x
B. x - 6
C. x - 3
D. 2x + 3
E. 2x + 6
Director
Joined: 14 Aug 2007
Posts: 704
Re: y in terms of x [#permalink]

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11 Nov 2008, 20:10
petercao wrote:
If 5^x – 5^x - 3 = (124)(5^y), what is y in terms of x?

A. x
B. x - 6
C. x - 3
D. 2x + 3
E. 2x + 6

simplifies to

5^x(1 - 1/5^3) = 124 * 5^y
5^x ( 124/5^3) = 124 * 5^y

(5^x)/(5^3) = 5^y

5^(x-3) = 5^y

y = x-3
C
Re: y in terms of x   [#permalink] 11 Nov 2008, 20:10
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# If 5^x 5^x - 3 = (124)(5^y), what is y in terms of x? A. x

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