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7 December, 11:29

Given ƒ (x) = 3x + 9, find x when ƒ (x) = 21.

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Answers (2)
  1. 7 December, 11:35
    0
    3x + 9 = 21

    3x = 12

    x = 4
  2. 7 December, 11:46
    0
    4

    Step-by-step explanation:

    ƒ (x) = 3x + 9; Substitute 21 for ƒ (x).

    21 = 3x + 9

    21 - 9 = 3x

    12 = 3x → x = 4
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