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14 February, 21:51

What is the inverse function of f (x) = - 3x+21

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  1. 15 February, 00:16
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    F (x) = - 3x + 21.

    y = - 3x + 21.

    just replace x with y and y with x:

    x = - 3y + 21; now isolate y:

    -3y = x - 21

    3y = - x + 21

    y = (-x+21) / 3

    f⁻¹ (x) = (-x+21) / 3
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