SOLUTION: Solve for A B C: 4a+7b=1 8a-2c=-38 6b-2c=20 How do I begin to do this?

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Question 417457: Solve for A B C:
4a+7b=1
8a-2c=-38
6b-2c=20
How do I begin to do this?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

solving sytem by Substitution

4a+7b=1  4a = 1-7b      

8a-2c=-38  c = 4a +19

6b-2c=20   c = 3b -10 

 4a + 19 = 3b - 10

(1-7b) + 19 = 3b - 10

         30 = 10b

           b = 3

           a = -5        | a = (1-7b)/4

           c = -1        | c = 3b -10