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.
An equation admits of description in two ways:â It may be regarded purely as an algebraic expression, or as a geometrical locus. It is a mere symbol, like the algebraic expression which stands for a curve.