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19 May, 10:54

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

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Answers (2)
  1. 19 May, 11:40
    0
    3x + 9 = 21

    3x = 12

    x = 4
  2. 19 May, 12:07
    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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