Definition of dray. : a vehicle used to haul goods; especially : a strong cart or wagon without sides.
Expressions versus Equations. A difference between expressions and equations is what each represents. An expression shows a math relationship. One key to an expression is that there is no solution. An expression does not have an answer. An expression, however, can be evaluated. To evaluate an expression, substitute values for the variables.
Infinite Solutions. In mathematics, we often come across with equations and expressions. An equation is an expression with an equal sign somewhere in between. Just to recall that an expression is made up of variables and constant terms conjoined together by the means of algebraic operators.