Mathematical Program

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Mathematical Program

I was wondering if anyone had written a program that would graph function
that weren't necessarily (not sure what the word is for it, on the tip of
my tongue...) exclusive (?).


For example, instead of plotting, for a circle: y={1, -1} SQR(-x^2+25)


you could plot: x^2+y^2=25


In this way you could plot x=3 (which isn't a real function) and also
quadratic equations without solving it for y first. In short, you could use
both x and y variables in the function (I guess then this wouldn't be a
function anymore then). Anyways, thanks for reading this.