Two-dimensional graph: Difference between revisions

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Graph of a non-function relation: this has nothing to do with polynomials
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In some cases the relation between two real variables cannot be written in the form <math>y=f(x)</math>. In other words, it is not a function. Nevertheless, the set of all points given by the relation is still a two-dimensional graph, as in the accompanying graph of the circle <math>(x-a)^2+(y-b)^2=1.</math>
 
An [[image (mathematics)|image]] of a [[plane curve]] is a also a two-dimensional graph, although only some two-dimensional graphs are an image of any plane curve.
 
==Superimposed graphs of more than one function==