Please explain in very detailed step by step

a. Given that f(x) = 4x - 13 where f(x) = y, define a function rule for f -1. f (y ) = Preview 3u + 9 b. Given that g( u) = 5 + 15 where g(u) = v, define a function rule for g g (v ) = Preview Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c Be sure your variables match those in the question Box 2: Enter your answer as an expression. Example: 3x 2+1, x/5, (a+b)/c Be sure your variables match those in the question Points possible: 1 License IInlimited attempts