What defines an indirect (inverse) relationship?

An indirect (or inverse) relationship is characterized by the behavior of two quantities where, as one quantity increases, the other quantity decreases. This means that there is a negative correlation between the two variables, which can often be seen in various mathematical contexts such as in the relationship between pressure and volume in gases (in accordance with Boyle's Law), where increasing the volume leads to a decrease in pressure if the temperature is constant.

In an indirect relationship, the values of the two variables move in opposite directions. For example, if you consider the speed of a car and the time taken to travel a fixed distance, as the speed increases, the time taken decreases. This clear interaction illustrates the essence of an indirect relationship, making the option that states "as one quantity gets larger, the other gets smaller" the correct representation of this concept.