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.
hide 12 types... equation. a mathematical statement that two expressions are equal. a group of symbols that make a mathematical statement. the equation representing the relation between selected values of one variable (x) and observed values of the other (y); it permits the prediction of the most probable values of y.