What is an equation that describes a known relationship among quantities (such as tempature) called

An equation that describes a known relationship among quantities (such as temperature) is called a formula. Formulas include more than one variable and are written so that one variable is already isolated. To find the value of this variable, you need to evaluate the expression on the other side of this variable. The variables in the expression will contain values. Formulas can be solved in a single step or multiple steps. Multiple step formulas consist of a series of steps and are solved one step at a time.