SOLUTION: I have a BIG test and I need some help. Given f(x) = -5x-1, find f(a-1). How do you solve this? Thanks in advance.

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons  -> Linear Equations Lesson -> SOLUTION: I have a BIG test and I need some help. Given f(x) = -5x-1, find f(a-1). How do you solve this? Thanks in advance.      Log On


   

Question 90358: I have a BIG test and I need some help. Given f(x) = -5x-1, find f(a-1).
How do you solve this? Thanks in advance.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
f%28x%29+=+-5x-1

f%28a-1%29+=+-5%28a-1%29-1 Plug in x=a-1 (just replace every x with a-1)

f%28a-1%29+=+-5a%2B5-1 Distribute

f%28a-1%29+=+-5a%2B4 Combine like terms