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.
Expressions obviously are different because they donât have any distinct or definite solution to the problem. To sum up: 1.Expressions are incomplete mathematical phrases whereas equations are complete mathematical statements. 2.Expressions are like the typical English phrase whereas equations are complete sentences.