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F (x) = 5 x - 6    is a one to one function as  for every x there is a unique defined value of f(x). 

x = [ f(x) + 6 ] / 5    so for every value of f(x) , there is a unique value of x.

   formula for inverse function is :

       F^-1 (y)  = [ y + 6 ] / 5      replace  f(x)  by  y and  x by f^-1(y)  or,
       it is same as      f^-1(x) = (x+6)/5

1 5 1