Visual representation of a data set or a mathematical equation , inequality , or function to show relationships or tendencies that these formulas can only suggest symbolically and abstractly.
Though coordinate system . For example, a graph of the relationship between real numbers and their squares matches each real number on a horizontal axis with its square on a vertical axis. The resulting set of points in this case is a parabola . A graph of an inequality is usually a shaded region on one side of a curve, whose shape depends not only on the equation or inequality but on the coordinate system chosen.