Given a graph with a line running through coordinates (0,0) and coordinates (40,12), the unit rate of the relationship between the number of kilometers traveled by a bicycle (y) and the number of minutes (x) is given by the slope of the line.
Therefore, the unit rate is given by:
[tex]Unit\ rate= \frac{y_2-y_1}{x_2-x_1} \\ \\ = \frac{12-0}{40-0} = \frac{12}{40} = \frac{3}{10}\ kilometers\ per\ minute[/tex]
