1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Simple question about finding A and B

  1. Jul 5, 2012 #1
    80A = 12000 - AB
    2000A = 2000 - AB

    I can find A and B right? If not I can provide more??

    Thanks :eek: !!
  2. jcsd
  3. Jul 5, 2012 #2
    Yes you can find out A and B !
  4. Jul 5, 2012 #3
    also is there any way to set up excel so that as i change the figures the answer what A and B is automatically changes?

    i'm sorry to be so bad at math - it's been like 12 years since i stuided any :eek:
  5. Jul 5, 2012 #4
    honestly - i am using software that runs out in like 20 hours. this is a music hobby thing - i don't suppose you can give me the answer plus also if excell will do it for me?? i know it'd be simple for everyone here.... :) :) !!

    there are online calculators but they don't seem to cope with the A*B component!!!
  6. Jul 5, 2012 #5


    User Avatar
    Science Advisor

    Hey clemon.

    Minus the first equation from the second and collect the terms for the A's and solve for A. Then plug A into one of the equations and solve for B.
  7. Jul 5, 2012 #6
    they don't converge!!

    what about:


  8. Jul 5, 2012 #7
  9. Jul 5, 2012 #8
    thanks - i'm trying to find it with excel atm. not sure if these figures even converge tbh.
  10. Jul 5, 2012 #9


    User Avatar
    Science Advisor

    80A = 12000 - AB
    2000A = 2000 - AB

    Didn't you consider getting rid of the "AB" term by subtracting one equation from the other? 80A- 2000A= -1920A= 10000. Solve that for A and then solve either of the two equations, using that value of A, for B
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook