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.
Difference Between Equations and Functions. When students encounter algebra in high school, the differences between an equation and a function becomes a blur. This is because both use expressions in solving the value for the variable. Then again, the differences between these two are drawn by their outputs.