A function is a rule to calculate a variable, based on one or more other variables. It may be written as an equation, but unlike a generic equation, in a function, for every value of the input variables, it may ONLY have ONE result.
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An equation just has an equal sign. A function is basically just an equation without one!
There is one form of linear equation that is not a function, and that is when x = c, where c is a constant.
i may only be 10 yrs old but i can say that an equation is not an function like the graphs of quadratic functions you will only be given an equation
mathematical equation
i dont know 8x+5y=89