An expression is a set of terms combined using the operations +, , x or ÷, for example 4 x 3 or 5 x 2 3 x y + 17. An equation states that two expressions are equal in value, for example 4 b 2 = 6.

GCSE AQA Algebraic expressions - AQA Proof - Higher Letters can be used to stand for unknown values or values that can change. Formulas can be written and equations solved in a range of problems ...

Examples of Algebraic Expressions: x + 3, 4xy + 7, 2y – 5, etc Algebraic Expressions are formed using variables (letters) and constants.