**Graph of an Equation or Inequality**

The picture obtained by plotting all the points of an equation or inequality.

If there is only one variable, the graph is on a number line. If there are two variables, the graph is on the coordinate plane. If there are three variables, the graph is in three-dimensional coordinates. In general, for *n* variables, the graph is in *n* dimensions.

For example, the graph of the equation *y = x + *1 given below is obtained by plotting all the points with a *y*-coordinate that is 1 larger than the *x*-coordinate.

**See also**

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