Question 417457
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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