produce these slices in the first place, thus making some slices appear bigger than others. If you are making a

bar graph, you can make the vertical axis either taller or shorter, which will tend to make variations in the

height of the bars appear more or less.

Being able to read graphs is an essential skill, both in economics and in life. A graph is just one perspective or

point of view, shaped by choices such as those discussed in this section. Do not always believe the first quick

impression from a graph. View with caution.

Key Concepts and Summary

Math is a tool for understanding economics and economic relationships can be expressed mathematically

using algebra or graphs. The algebraic equation for a line is y = b + mx, where x is the variable on the

horizontal axis and y is the variable on the vertical axis, the b term is the y-intercept and the m term is the

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