: Let f RR be defined by f(x) =5x-1 for all x E R. We will prove that fis bijective in two ways. (a) First, prove that f is bijective by proving that f is one-to-one and onto. (i.e. that f satisfies the definition of bijective) (b) Second, prove that f is bijective by showing that f is invertible. In otherwords, define a function g: RR such that fog = idR and go f = idr.