SOLUTION: Given f(x)=3x+4 Find f -1(x)

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Question 56068: Given f(x)=3x+4
Find f -1(x)
Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
Given f(x)=3x+4
Find f%5E%28-1%29%28x%29
Let y=f(x)
y=3x+4
Switch the x's and y's and solve for y.
x=3y+4
x-4=3y+4-4
x-4=3y
%28x-4%29%2F3=3y%2F3
%28x-4%29%2F3=y
Let y=f%5E%28-1%29%28x%29
highlight%28f%5E%28-1%29%28x%29=%28x-4%29%2F3%29
Happy Calculating!!!