# Variable (Mathematics)

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In mathematics, a variable is a symbol that represents a quantity or a value that can change. It is commonly used in mathematical expressions, equations, and functions. Variables are used to denote unknowns or placeholders for values that can vary or be determined.

Here are some key points about variables in mathematics:

1. Representation: Variables are typically represented by letters, such as x, y, or z, although other symbols or combinations of symbols can also be used. Each variable represents a specific value or set of values.
2. Unknowns: Variables are often used to represent unknown quantities in equations or problems. By assigning a variable to an unknown quantity, we can use mathematical operations to solve for the value of the variable and find the solution to the problem.
3. Independence: Variables can be independent or dependent. Independent variables are those that are freely chosen or controlled and are not affected by other variables. Dependent variables, on the other hand, are influenced by one or more independent variables and their values depend on the values of the independent variables.
4. Manipulation: Variables can be manipulated using mathematical operations, such as addition, subtraction, multiplication, and division. Equations and expressions involving variables allow us to describe relationships between quantities and perform calculations.
5. Context: Variables can be used in various mathematical contexts, including algebra, calculus, statistics, and geometry. They provide a flexible framework for representing and analyzing mathematical relationships and solving problems.
6. Generalization: Variables allow for generalization and abstraction in mathematics. By using symbols to represent quantities, mathematical concepts and relationships can be expressed in a concise and universal way, enabling mathematical reasoning and the development of mathematical theories.

Variables play a fundamental role in mathematics, allowing us to describe, analyze, and solve problems involving quantities that can vary. They provide a powerful tool for modeling real-world situations, formulating mathematical relationships, and conducting mathematical investigations.