a + 4 = 2b c – 5 = a + b a + b + c = 72 What is a, b, and c separately pls help I’ll give brainiest

Question

a + 4 = 2b
c – 5 = a + b
a + b + c = 72

What is a, b, and c separately pls help I’ll give brainiest

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Edana Edana 4 years 2021-08-17T08:02:34+00:00 1 Answers 11 views 0

Answers ( )

  1. thucuc
    0
    2021-08-17T08:04:28+00:00
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    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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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )