SOLUTION: if f(3a-1) = 12a-7 find f(x) I tried subracting the two to find f(a) but I don't get the right answer. I need to see some step by step so that I can do others like it. Thank you.

Algebra ->  Rational-functions -> SOLUTION: if f(3a-1) = 12a-7 find f(x) I tried subracting the two to find f(a) but I don't get the right answer. I need to see some step by step so that I can do others like it. Thank you.      Log On


   

Question 338722: if f(3a-1) = 12a-7 find f(x) I tried subracting the two to find f(a) but I don't get the right answer. I need to see some step by step so that I can do others like it. Thank you.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: Assume f(x) is linear. So f%28x%29=mx%2Bb and that f%283a-1%29=m%283a-1%29%2Bb. If that's the case, then m%283a-1%29%2Bb=12a-7.