Final answer:
True, line graphs, pie graphs, and bar graphs are effective in showing relationships and comparisons between variables, presenting data visually to reveal patterns and trends.
Step-by-step explanation:
It is true that graphs, charts, and tables are all useful tools for demonstrating relationships or differences between two or more variables. A line graph is often the most effective format for illustrating a relationship between two variables that are both changing, like a time series graph which can show changes in the unemployment rate over time. Economic models can utilize these visual aides to illustrate data such as patterns, comparisons, trends, and apportionment in an intuitive manner. For instance, pie graphs are useful for showing how a total is divided into parts, with each slice representing a percentage of the whole. Meanwhile, bar graphs use the height or length of bars to depict a relationship, where each bar can represent an entity or be divided into segments to show subgroups.