Asked by Anonymous

if a+3b=13 and a+b=5, the value of b is

a 4.5
b 7
c 1
d 4
Answered by Reiny
use substitution
change the second to a = 5-b
now sub that back into the first
let me know what you got for b.
Answered by Anonymous
i got my answer as 1 (C).is that correct !!!
Answered by Reiny
no
from the second: a = 5-b

that into the first:
a+3b=13
(5-b) + 3b = 13
2b = 13-5
2b=8
b = 4
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