anonymous
  • anonymous
help, 57 and 58. medal and fan
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
Ok, starting with 57, they give you an equation and they want to know if r=9 is a solution. All you have to do is plug in 9 for r on both sides of the equation and solve. If both sides balance out then it's a solution, if they don't it's not a solution.
anonymous
  • anonymous
so 2-9/5?

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anonymous
  • anonymous
\[\frac{ 2-r }{ 5 }+\frac{ 3r }{ 5 }=\frac{ r+2 }{ 3 }\] \[\frac{ 2-9 }{ 5 }+\frac{ 3\times9 }{ 5 }=\frac{ 9+2 }{ 3 }\]
anonymous
  • anonymous
i got 5.6=9.66
anonymous
  • anonymous
that's not what I got...work on the numerators first...2-9=? and 3x9=?
anonymous
  • anonymous
-7 and 27
anonymous
  • anonymous
perfect, so you have -7/5+27/5...what do you get?
anonymous
  • anonymous
common denominators means you can add the numerators...denominator stays the same.
anonymous
  • anonymous
20/5=4
anonymous
  • anonymous
good, now what about the right side of the equation...(r+2)/3?
anonymous
  • anonymous
11/3
anonymous
  • anonymous
exactly, so now you just need to ask yourself if 4=11/3. Then you'll have your answer!
anonymous
  • anonymous
thank you
anonymous
  • anonymous
what about 58?
anonymous
  • anonymous
it's been awhile since I've done a problem like that. I'm solving it now so I can hopefully help you :)
anonymous
  • anonymous
thank you !!!!!
anonymous
  • anonymous
ok, so in theory I have an answer. I'm just going to check quick to be sure!
anonymous
  • anonymous
okay
anonymous
  • anonymous
my original work gave me an answer of 4/3, but when I plug it in it doesn't work out right.
anonymous
  • anonymous
I'm sorry, it's just been too long...I can't remember how to do it correctly. :(
anonymous
  • anonymous
thats okay. its jst one question! ill jst make a educational guess

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