What is the inverse function f−1(x)f^{-1}(x)f−1(x) of f(x)=3x−1f(x) = 3x - 1f(x)=3x−1?
f−1(x)=x+13f^{-1}(x) = \frac{x+1}{3}f−1(x)=3x+1
f−1(x)=x−13f^{-1}(x) = \frac{x-1}{3}f−1(x)=3x−1
f−1(x)=3x+1f^{-1}(x) = 3x + 1f−1(x)=3x+1
f−1(x)=x3−1f^{-1}(x) = \frac{x}{3} - 1f−1(x)=3x−1