The following equations graph each of the three models connecting the age of a dog with a relative age of a human. X value, or horizontal axis, is the real years, the years a dog has been alive. the Y value, or vertical axis, is a corresponding human age.
The green represents the simple "7 human years = 1 dog year" linear relationship.
The red represents the two-piece piecewise function.
The black represents the three-piece piecewise function.
They graph as follows:
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