math

I'm a little confused on how to solve this system of equations.

5a=5
6b-3c=15
2a+7c=-5

Thanks

asked by Anonymous
  1. The first equation gives a = 1 when you divide both sides by 5

    Now do the third equation substituting 1 for a
    2*1 + 7 c = -5
    7 c = -7
    c = -1

    so now we have a = 1 and c = -1
    Use those in the middle equation
    6 b - 3 (-1) = 15
    6 b + 3 = 15
    6 b = 12
    b = 2

    posted by Damon
  2. Ah, I get it now. Thanks

    posted by Anonymous

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