Question

If f(x) varies directly with x, and f(x) = 72 when x = 8, find the value of f(x) when x = 3.

A.
9

B.
18

C.<=my answer
27

D.
192

Answer 1

@MaddieLB

Answer 2

you're correct :)

\[y = k*x\]

\[\frac{ y }{ x } = k => \frac{ 72 }{ 8 } = 9 = k \]

\[f(x) = 9x\]

Answer 3

@Photon336 but i chose c which is 27 so is it that or a 9

Answer 4

well @gamereternity 9*x is the function. when we plug in x = 3 we get 27 so you're correct.

Answer 5

ooh ok ty very much