How does a graph describe the functional relationship between two quantities?

A graph visually represents the functional relationship between two quantities by plotting one quantity on the x-axis and the other on the y-axis. The resulting curve or line illustrates how changes in one quantity correspond to changes in the other, revealing patterns such as linearity, trends, or correlations. By analyzing the shape and slope of the graph, one can infer the nature and strength of the relationship, including whether it is direct, inverse, or non-linear. Overall, graphs provide a clear and intuitive way to understand and communicate the relationship between the two variables.