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

DO YOU KNOW THE EQUATION THAT WE USE FOR DIRECT VARIATION ?

Answer 2

F(X) = KX

Answer 3

perfect replace f(x) by -9
and x by 3
then solve for k

Answer 4

ok then would i have -9 = k times 3

Answer 5

yes right :)

Answer 6

now solve for k :)

Answer 7

k = -9/3

Answer 8

yes right now reduce that fraction :)

Answer 9

-3

Answer 10

YES SO k = -3
now use that same equation and replace k by -3
then u r done

Answer 11

-9 = -3 times 3?

Answer 12

nope just replace k by -3
f(x)=kx <-- just k

Answer 13

f(x) = -3

Answer 14

hmm where is x
who kidnapped da X ?? ;)

Answer 15

ha ha :D, f(x) = -3x

Answer 16

looks greeat!

Answer 17

Awesome! Thank you!!

Answer 18

goood job i really like how u worked :)keep it up!!and
\(\huge\color{green}{{\rm my }~\rm pleasure !! :)}\) \(\Huge \color{blue}{\star^{ \star^{\star:)}}}\Huge \color{red}{\star^{ \star^{\star:)}}}\)
\(\Huge \color{orange}{\star^{ \star^{\star:)}}}\Huge \color{purple}{\star^{ \star^{\star:)}}}\)

Answer 19

:)

Answer 20

\[\huge \ddot \smile\]\[\huge \ddot \smile\]\[\huge \ddot \smile\]