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Math Help - solve equation

  1. #1
    Senior Member
    Joined
    Oct 2008
    Posts
    323

    solve equation

    solve the equation 2(a,3,c)+3(c,7,c)=(5,b+c,15) for a,b,c

    i got to setting up 3 equation

    2a+3c=5
    6+21=b+c
    2c+3c=15

    i don't know where to go from here
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  2. #2
    Newbie
    Joined
    Jan 2010
    From
    Canada
    Posts
    11

    Substitution

    Hi,

    Just isolate the variables then use substitution.

    a=(5-3c)/2

    then put that in one of the other equations... then do it again until you only have 1 variable in the equation. Then repeat.
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  3. #3
    Newbie
    Joined
    Jan 2010
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    Canada
    Posts
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    I just realized that the last equation only has variable 'c' in it... That would be the easiest one to use...

    2c+3c=15
    5c=15
    c=3

    then put "c" in equation 1 and 2 to get values for "a" and "b"
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