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3 years ago

A + 4 = 2b

Mathematics

1 answer:

Nataliya [291]3 years ago

5 0

Answer:

a=21

b=25/2

c=77/2

Step-by-step explanation:

from eq 1

a+4=2b => a=2b-4

substituting value of a in eq 2

c-5=a+b => c-5=2b-4+b => c =3b+1

now, substituting value of a and c in eq 3

a+b+c=72 => 2b-4+b+3b+1 =72 => 6b-3=72 => b= 75/6 => b=25/2

substituting value of b in :

c=3b+1 ( you will get c )

then substitute value of b in :

a=2b-4 ( to get a)

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