Definition of dray. : a vehicle used to haul goods; especially : a strong cart or wagon without sides.
The main difference between an equation and a function is the fact that an equation usually deals with a single input, whereas, a function can have numerous inputs. In mathematics, an equation is used to denote the equality between two expressions.
Originally Answered: What is the difference between formulas and equations? A formula is usually a general rule, written in the form of algebra (letters to represent different quantities) to more easily and succinctly portray the information. That whole thing can be written as [math]F=ma[/math], which means exactly the same thing. An equation is any mathematical text that has an equal sign.