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.
Formula, expression, identity, equation? Do you understand the difference between a formula, expression, identity and equation? A formula is a rule written using symbols that describe a relationship between different quantities. An expression is a group of mathematical symbols representing a number or quantity. Expressions never have equality or inequality signs like =, >, <, â  ,â¥ ,â¤. Some examples. 3a. 3xy + 4x. tÂ² + tÂ³. An identity is an equation that is always true, no matter what values are chosen. Examples. 3a + 2a = 5a. xÂ²+xÂ² = 2xÂ². 5 x 10 = 10 x 5. An equation is a mathematical statement that shows that two expressions are equal. It always includes an equals sign.