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22 September, 09:46

If f (x) varies directly with x and f (x) = 50 when x = - 10, then what is f (x) when x = 15

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  1. 22 September, 11:09
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    It is - 30 because if x=-10 and f (x) = 50 you have to divide 50/-10=-5 then you do x=15 x-5=-30
  2. 22 September, 12:01
    0
    F (x) = 50 x = - 10

    If x=1, then f (x) = 50/-10 = - 5

    Therefor, when x=15, f (x) = 15*-5 = - 30
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