Final answer:
The equation r=10p represents a formula that connects two quantities with a constant of proportionality.
Step-by-step explanation:
In this situation, the equation r=10p represents a formula that connects the variable r, which stands for a certain quantity, with the variable p, which represents another quantity. The number 10 is a constant of proportionality that relates the two quantities. For example, let's say r represents the number of gallons of gasoline used in driving p miles. In this case, the equation r=10p means that for every mile driven, 10 gallons of gasoline are used.
So, in this situation, r represents the number of gallons of gasoline used, 10 is the constant of proportionality (meaning 10 gallons for every 1 mile driven), and p represents the number of miles driven.