Q: 7 Letf: NY be a function defined as f (x) = 4x + 3, where,...

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Q: 7 Letf: NY be a function defined as f (x) = 4x + 3, where, Y = {y N: y = 4x + 3 for somex N}. Show that f is invertible. Find the inverse. [10] Q: 8 Let f: X Y be a function. Define a relation R in X given by R = {(a, b): f(a) = f(b)). Examine if R is an equivalence relation. [10] Q: 7 Letf: NY be a function defined as f (x) = 4x + 3, where, Y = {y N: y = 4x + 3 for somex N}. Show that f is invertible. Find the inverse. [10] Q: 8 Let f: X Y be a function. Define a relation R in X given by R = {(a, b): f(a) = f(b)). Examine if R is an equivalence relation. [10]