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 October 31st, 2013, 09:12 AM #1 Newbie   Joined: Jan 2010 Posts: 6 Thanks: 0 Algebra problem I want to make B the subject, but i don't know how to. Please may someone tell me how it's done? Code: (A-B)/B = C Thanks for any help Rob
 October 31st, 2013, 09:16 AM #2 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond Re: Algebra problem (A - B)/B = C A/B - 1 = C A/B = C + 1 A = B(C + 1)
October 31st, 2013, 09:19 AM   #3
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Re: Algebra problem

Quote:
 Originally Posted by greg1313 (A - B)/B = C A/B - 1 = C A/B = C + 1 A = B(C + 1)

Hi,

Thanks for that. I originally made my original post wrong. I'm actually looking for B, not A.

Although, i have to ask, how did you get the -1 on your second line. I'm puzzled by how this has happened. Please may you explain?

 October 31st, 2013, 09:22 AM #4 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond Re: Algebra problem (A - B)/B = A/B - B/B = A/B - 1
October 31st, 2013, 09:26 AM   #5
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Re: Algebra problem

Quote:
 Originally Posted by greg1313 (A - B)/B = A/B - B/B = A/B - 1
Thank you.

And with that explanation, i am also able to get the B that i'm looking for.

October 31st, 2013, 10:47 AM   #6
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Re: Algebra problem

Quote:
 Originally Posted by Shocker (A-B)/B = C
You can also start with cross-multiplication (example: if a/b = x/y, then ay = bx):
A - B = BC
BC + B = A
B(C + 1) = A
B = A / (C + 1)

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