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a + b  +c = 10

a + b - c = 3

 find the value of

a + b + 3c

Sagot :

Secretlybluidn
ok if you look at the first to equations carefully you will see that 2 things have changed between the 2. the "+c" is now "-c" and the "10" is now "3"

if we think about it you will see that c=7. well how do we know. when c or 7 was taken away from the problem it left you with 3 

so that means a+b=3

we dont need to know what the exat value of a or b is.

so a+b +3c
      (3) + 3(7)
       3   +  21
         24

a+b+3c=24
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