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18 September, 04:26

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

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  1. 18 September, 04:41
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    x=5

    Step-by-step explanation:

    F (x) = -3x+21,

    f (x) = 6 = - 3x+21

    6 = - 3x+21

    Subtract 21 from each side

    6-21 = - 3x+21-21

    -15 = - 3x

    Divide each side by - 3

    -15/-3 = - 3x/-3

    5 = x
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