(adsbygoogle = window.adsbygoogle || []).push({}); The origin of "m"?

Why is it that linear functions are often expressed in terms of f(x)="m"x+b? I mean, when dealing with all the other polynomials, we follow the typical f(x) = ax^n + bx^(n-1) + cx^(n-2)... so where did "m" come from? Why don't all text books just express it as f(x) =ax+b?

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# The origin of m ?

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