Hi

f(x)=3-6x

 y = 3 - 6x   ||Finding the Inverse (interchanging the x and y )

 x = 3 - 6y'

 6y' = 3-x

 y' = (3-x)/6

f '(9) = (3-9)/6 = -6/6 = -1 

RELATED QUESTIONS

If f(1) = -3 and f(x+2) = 3*f(x) - 3, find f(9).  (answered by jim_thompson5910)

f(x)=(6x-7)^3+5
find... (answered by jim_thompson5910)

f(x)=(6x-7)^3+5
find... (answered by Fombitz)

If f(x)= 9x + 1, find f^-1 (f (3)... (answered by jim_thompson5910)

If f(x) = 6x + 7 and g(x) = x² - 4, find each value. 

1.) f(-3) 
2.) f(m)
3.) f(r-2)
 (answered by Edwin McCravy)

if f(x)=1/(x-3) and g(x)=f(6x) what is... (answered by Fombitz)

What is f(x + 1) if f(x)= 6x^3 - 3x^2 + 4x - 9

I REALLY appreciate the help!  (answered by stanbon)

If f(x) = x^2 - 6x find:

f(a+1)-f(a)... (answered by jim_thompson5910)

Find f^-1(x) if f(x)=... (answered by MathLover1)