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How to Read and Understand Graphs

Appendix to Chapter 1

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Time Series Graphs (Figure1A.1)

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Time Series Graphs (Table 1A.1 & Figure 1A.2)

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A Cartesian Coordinate System (Figure 1A.3)

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A Cartesian Coordinate System (Figure 1A.4 and Table 1A.2)

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Positive and Negative Slopes of Curves (Figure 1A.5)

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Calculating the Slope of a Line

The slope of a line measures how much the variable on the y-axis changes when the variable on the x-axis changes by one unit.

SLOPE = ΔY = Y2 - Y1

ΔX X2 - X1

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Changing Slopes Along Curves (Figure 1A.6a)

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Changing Slopes Along Curves (Figure 1A.6b)

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Changing Slopes Along Curves (Figure 1A.6c)

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Changing Slopes Along Curves (Figure 1A.6d)

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Changing Slopes Along Curves (Figure 1A.6e)

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Changing Slopes Along Curves (Figure 1A.6f)

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Review Terms and Concepts

cartesian coordinate system

graph negative relationship origin positive relationship

slope time series graph x-axis y-axis y-intercept