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23 July, 22:20

What is the value of k in the function f (x) = 112-kx if f (-3) = 122

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  1. 23 July, 23:07
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    f (x) = 112 - kx

    if f (-3) = 122

    so

    f (-3) = 112 - k (-3)

    122 = 112 - (-3k)

    122 = 112 + 3k

    122 = 112 + 3k

    so 3k = 122 - 112

    3k = 10

    k = 10/3

    or

    k = 3 1/3
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