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A variable is a symbol, usually a letter like x or y, that represents an unknown or changeable quantity in a mathematical expression or equation.
An algebraic expression is a combination of variables, constants, and operations (such as addition, subtraction, multiplication, and division) without an equals sign. For example, 3x + 5 is an algebraic expression.
A coefficient is the numerical factor multiplied by a variable in a term. In the term 7x, the coefficient is 7.
A constant is a fixed numerical value that does not change. In the expression 2x + 9, the constant is 9.
To evaluate an expression means to substitute specific values for the variables and then simplify using the order of operations to obtain a numerical result.