Variables

In math, a variable is a symbol that represents a value that can change. It is a placeholder for an unknown quantity. Variables are commonly represented by letters, such as x, y, or z.

Variables are used in mathematical expressions and equations to denote unknown or changing values. They allow us to write general rules and formulas without knowing the specific values of the quantities involved.

For example, in the equation 2x + 3 = 7, the variable x represents an unknown number. By solving the equation, we can find the value of x that satisfies the equation.

Variables are also used in algebraic expressions to represent relationships between quantities. They are fundamental to the understanding and manipulation of mathematical concepts.