For this case, the first thing we must do is define variables.
We have then:
x: number of hours
y: total rental charge
The equation modeling the problem is given by:
\(y = 10x
\)
From here, we observe that the relation between both variables is proportional, being the constant of proportionality equal to $ 10 per hour.
Answer:
The rental charge is proportional to the number of hours you rent the bicycle:
\(y = 10x\)
