The term “function” just means “equation based on or dependent on a variable” you can substitute a different variable. For example if “y” is a function of “x” and that function is “cos(x)+isin(x)” then f(x)=cos(x)+isin(x) and y=f(x) so y=cos(x)+isin(x).
The main purpose of learning to think in terms of f(x) =mx+b rather than y=mx+b is because f(x) works easier in calculus.
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