Consider a dataset of numbers y1, y2, ..., yn and  the linear function f(x) = 9x − 4.  Prove or find a counterexample to disprove. If a ≤ b, show that f(a) ≤ f(b). since it is a monotonic function that is increasing i was thinking of doing the derivative to prove it but i dont what else to do more to prove it after doing it.

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