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.
An equation is a statement in which two algebraic expressions are equal. Linear Equations of one variable is the equation which involves only one variable. General form of a linear equation of one variable is ax + b = 0, where a i s not equal to 0.