Ok. An inverse function is formed from switch in the input and output variables(x,y).
so y = 3x -1
flip x = 3y-1 and solve for y again
y = 1/3(x+1)
so f^-1(x) = 1/3(x+1)
and the inverse of an inverse function is the original equation: f(x) = 3x-1
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