(追記) (追記ここまで)
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