How is a variable commonly represented?

A variable is commonly represented as a symbol, which serves as a placeholder for a value that can change. In mathematics, symbols such as x, y, and z are often used to represent variables. This symbolic representation allows for the formulation of equations and expressions where the variable can take on different values in order to solve problems or demonstrate relationships between quantities.

Using a symbol to represent a variable is essential for abstraction, enabling mathematicians and students to work with concepts without needing to specify exact values. This is particularly useful in algebra, where variables are manipulated to find unknown quantities. Thus, the correct representation of a variable as a symbol is foundational to various mathematical operations and problem-solving strategies.