Question

If f(x) varies directly with x, and f(x) = 48 when x = 8, how do you find the value of f(x) when x = 2?

Answer 1

16

Explanation:

Here `f(x) prop x`

`rArr f(x) = k x` ...... (i)

putting the value of f(x)=48 and x=8 in (i),

we get, 48 = k 8

`rArr k = 48/8 = 6`

Now, putting value of k and x in (i),

we get `f(x) = 8xx2 = 16`