slope. The slope of a line is the same at any point on the line and it indicates the relationship (positive,

negative, or zero) between two economic variables.

Economic models can be solved algebraically or graphically. Graphs allow you to illustrate data visually. They

can illustrate patterns, comparisons, trends, and apportionment by condensing the numerical data and

providing an intuitive sense of relationships in the data. A line graph shows the relationship between two

variables: one is shown on the horizontal axis and one on the vertical axis. A pie graph shows how something is

allotted, such as a sum of money or a group of people. The size of each slice of the pie is drawn to represent the

corresponding percentage of the whole. A bar graph uses the height of bars to show a relationship, where each

bar represents a certain entity, like a country or a group of people. The bars on a bar graph can also be divided

into segments to show subgroups.
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