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18 September, 07:58

2a-1=19 solve. two step equation

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Answers (2)
  1. 18 September, 09:56
    0
    2a - 1 = 19 ... add 1 to both sides

    2a - 1 + 1 = 19 + 1 ... simplify

    2a = 20 ... divide both sides by 2

    (2/2) a = 20/2

    1a (or just a) = 10
  2. 18 September, 11:53
    0
    2a - 1 = 19

    2a = 20

    a = 10
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