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Online ProgramA study was conducted on how a certain nutritional supplement affects weight loss. The table and graph above show the weight \(w\), in pounds, of a single male subject \(t\) days after he began taking the supplement.
The function \(w\), defined by \(w(t)=-mt+b\), where \(m\) and \(b\) are constants, models the weight, in pounds, of the subject \(t\) days after he began taking the supplement during a span of time in which the weight loss of the subject is approximately linear. What does \(m\) represent?