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.
It is a formula with an equal sign    * * * * *    No. Each side of the equal sign is an expression but the whole is  an equation. An expression is a combinatio â¦ n of numbers and  operators without an equality (or inequality) sign.