defines a variable in an algebraic expressiona nd equation

• Algebraic expression is a combination of variables, numbers, operations, and grouping symbol
• in an algebraic expression, any letter that represents a number is called a variable. A number may replace a variable
• A specific or fixed number represents a constant. Terms are the parts of an algebraic expression seperated by the operation symbols "=" or "-"
• a numerical coefficient is a constant multiplier of the variables in a term