can you pleae explain how to get these answers

Problem 5 (4 points, 2 pt each): a) Show that the function f(x)-ax+b from R to R is invertible, where a and b are constants, with a # 0 . Remember, showing a function is invertible is the same as showing it is one-to-one and onto. (In problem 4 above, you just needed to state whether the function is one-to-one and onto. In this problem, you need to show it.) ou ne on SOLUTION: f (x) is one-to-one because (x) is onto because for any y, let -(y-b)/a thenf(x)-s((y-b)la)-y b) What is the inverse of f(x) from part a)? SOLUTION: f()--b)la (s (x)-(x-b)/a is also an acceptable solution.)