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18 September, 23:35

Given f (x) = - 3x + 21, find x when f (x) = 6.

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  1. 19 September, 00:23
    0
    x = 5

    Step-by-step explanation:

    Given

    f (x) = - 3x + 21 and f (x) = 6, then equating gives

    - 3x + 21 = 6 (subtract 21 from both sides)

    - 3x = - 15 (divide both sides by - 3)

    x = 5
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