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18 August, 13:37

K (x) = 1/3 (x+9) and k (x) = -4, so x=?

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Answers (2)
  1. 18 August, 13:53
    0
    x = - 21

    Step-by-step explanation:

    k (x) = 1/3 (x+9) and k (x) = -4

    Set them equal

    1/3 (x+9) = -4

    Multiply each side by 3

    3*1/3 (x+9) = -4*3

    x+9 = - 12

    Subtract 9 from each side

    x+9-9 = - 12-9

    x = - 21
  2. 18 August, 14:02
    0
    x = - 21

    Step-by-step explanation:

    if k (x) = - 4 you can substitute that into the original equation:

    -4=1/3 (x+9)

    multiply both sides of the equation by 3

    -12=x+9

    subtract 9 from each side

    -21=x
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