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3 March, 12:40

5a - 10b = 45, when b = 3?

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Answers (2)
  1. 3 March, 12:44
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    5a - 10 * 3 = 45

    5a - 30 = 45

    5a = 75

    a = 75 : 5

    a = 15
  2. 3 March, 13:07
    0
    If b = 3, and 5a - 10b = 45. Then "a" must be ...

    Okay, so let's plug in what we know: 5a - 10 x 3 = 45 or 5a - 30 = 45

    We now know that 5a = 30 + 45 or 5a = 75

    Then, divide: 75 / 5 = 15

    a = 15!
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