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13 March, 06:53

The function f (x) varies directly with x, and f (x) = 45 when x=9 evaluate f (x) when x=3

a) 5

b) 9

c) 15

d) 27

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Answers (2)
  1. 13 March, 07:51
    0
    The answer is -

    c) 15
  2. 13 March, 09:46
    0
    F (x) is the same as y

    9/45 = 3 / y

    cross multiply

    (9) (y) = (45) (3)

    9y = 135

    y = 135/9

    y = 15 <==
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