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10 September, 07:08

a + b + c = 10

a + b - c = 3

find the value of

a + b + 3c

+4
Answers (1)
  1. 10 September, 10:01
    0
    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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