*[[ThreeA '''two-dimensional graph]]''' may refer to ▼
[[Image:cubicpoly.svg||right|thumb|400 px| Graph of the function <math>f(x)={{x^3}-9x} \!\ </math>]]
* The [[graph of a function]] of one variable
* A [[planar graph]]
* A [[diagram]] in a plane
{{mathdab}}
A '''two-dimensional graph''' is the [[graph of a function|graph]] of a [[function (mathematics)|function]] of one [[Variable (mathematics)|variable]] ''f''(''x''). Provided that ''x'' and ''f''(''x'') are [[real number]]s, the graph can be represented as a straight or curved [[curve]] in a [[two-dimensional]] [[Cartesian coordinate system]].
==Example==
The graph of the cubic polynomial on the [[real line]]
: <math>f(x)={{x^3}-9x} \!\ </math>
is
: {(''x'', ''x''<sup>3</sup>-9''x'') : ''x'' is a real number}.
If this set is plotted on a [[Cartesian plane]], the result is a curve (see figure).
