SOLUTION: I need some help with Logarithms. "For the function defined by f(x)=5x-4, find a formula for f^-1(x)." Thank you.

Algebra ->  Logarithm Solvers, Trainers and Word Problems -> SOLUTION: I need some help with Logarithms. "For the function defined by f(x)=5x-4, find a formula for f^-1(x)." Thank you.      Log On


   

Question 65585: I need some help with Logarithms.
"For the function defined by f(x)=5x-4, find a formula for f^-1(x)."
Thank you.
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
f(x) = 5x - 4 aka ~> y = 5x - 4
x = 5y - 4
x + 4 = 5y
x/5 + 4/5 = y
.2x + .8 = f^-1(x)
graph%28300%2C300%2C-10%2C10%2C-10%2C10%2Cx%2C5x+-+4%2C.2x+%2B+.8%29