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7 August, 11:11

If 2a=3b and 4a+b=21, then b =

+3
Answers (1)
  1. 7 August, 11:33
    0
    b=3

    Step-by-step explanation:

    2a=3b and 4a+b=21,

    Multiply the first equation by 2

    2 (2a) = 2*3b

    4a = 6b

    Substitute this into the second equation

    4a+b = 21

    Replace 4a with 6b

    6b+b = 21

    Combine like terms

    7b = 21

    Divide each side by 7

    7b/7 = 21/7

    b = 3
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