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7 October, 16:59

The function f (x) varies directly with x, and f (x) = 12 when x=8

which answer is the direct linear equation?

a) f (x) = 8x

b) f (x) = 12x

c) f (x) = 2/3x

d) f (x) = 3/2x

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Answers (1)
  1. 7 October, 17:21
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    The answer would be d.

    You can solve this by changing it up a little, such as changing it to f • x = 12

    you can then divide by 8, because x = 8.

    You're then left with f = 12/8 or 3/2

    multiply by x again on both sides, and voila, f (x) = 3/2x
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