Question

What is the direct variation equation if f(x) varies directly with x and f(x) = –9 when x = 3?
f(x) = -1/3x

f(x) = –3x

f(x) = –6x

f(x) = –12x

Answer 1

Any ideas to what the answer is?

Answer 2

I think it's D

Answer 3

Its not D try swapping in the number into the equation.

Answer 4

I got it it's C

Answer 5

one second ill double check.

Answer 6

wait I mean B.

Answer 7

I knew it lol I had to think for a sec. Thanks

Answer 8

I got confused halfway thru lol.

Answer 9

\[f(x) \alpha x \]

f(x) = kx (k const)

-9 = 3k , k = -3

f(x) = -3x