You have two variables: time and biking distance.
The biking distance is the dependient variable y (because depend of the time)
The time is the independient variable x
To find the constan of proportionality you use the next:
[tex]k=\frac{y}{x}[/tex]
If you make the calculation with all the data and get the same result, it is a proportional realtionship:
[tex]\begin{gathered} \frac{12}{1}=12 \\ \frac{26}{2}=13 \\ \frac{36}{3}=12 \\ \frac{44}{4}=11 \\ \frac{50}{5}=10 \end{gathered}[/tex]
The relation between the variables is not proportional.
