Question

If f(x) varies directly with x, and f(x) = 45 when x = 9, find the value of f(x) when x = 3.
(Points : 1)
5
9
15
27

Answer 1

i think that it is 15 am i right?

Answer 2

yes

Answer 3

yes. :)

Answer 4

Yeah, that's what I got.

Answer 5

thank you:)

Answer 6

f(9) = 45 so f = 5. So when x = 3. 5*3 = 15

Answer 7

f(x) = k*x

45 = 9k

So k = 5

f(x) = 3(5)

f(x) = 15