anonymous
  • anonymous
20/15-x=5/x how do i solve this?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
is 15 - x in the denominator or just the 15?
anonymous
  • anonymous
yes
anonymous
  • anonymous
the 15-x is the denominator

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anonymous
  • anonymous
20 5 ------ = ---- 15 - x x Anytime you have a fraction = a fraction, you can cross multiply. 20(x) = 5(15 - x) distribute 20x = 75 - 5x add 5x to both sides 25x = 75 divide by 25 x = 3
anonymous
  • anonymous
thanks! will you help me out some more?
anonymous
  • anonymous
Sure
anonymous
  • anonymous
140-x/81=x/9
anonymous
  • anonymous
140 - x x ------- = --- 81 9 Because you have a fraction = a fraction - you cross multiply.
anonymous
  • anonymous
(140 - x) * 9 = 81 * x
anonymous
  • anonymous
now distribute
anonymous
  • anonymous
1260 - 9x = 81x
anonymous
  • anonymous
Add 9x to both sides
anonymous
  • anonymous
1260 = 90x
anonymous
  • anonymous
Divide both sides by 90
anonymous
  • anonymous
14 = x
anonymous
  • anonymous
thanks i get it now its a lot easier explained step by step like that you are a lot of help..

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