I remember seeing a map of the world (or just Europe?) showing the standard form of the equation of a straight line in different countries.
I can't think what to put into google to find it again. Can anyone help me?
I found https://www.reddit.com/r/math/comments/27y1io/formula_for_linear_equations_by_country_xpost/, but it seems to be about naming conventions for the parameters rather than form of the equation. It also may well be completely made up.
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