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.
Mathematics is full of equations and expressions. A mathematical expression is a set of variables and constants that are connected together with the help of algebraic operations : such as - addition (+), subtraction (-), multiplication (x), division (/), exponentiation (^) etc. On the other hand, equation is defined as an expression with equal sign.