Assuming Medicine remaining (in miligrams) in a person is representd by r and time is represented by t, the relationship between r and t can be determined by using two point form as,
[tex]\begin{gathered} \frac{r-50}{t-0}=\frac{50-40}{0-1} \\ r-50=t(-10) \\ r=-10t+50 \end{gathered}[/tex]
