Variable

Definition

A variable is a symbol or name that represents a value or quantity that can change or vary within the context of a mathematical or scientific expression. Variables are fundamental in modeling and solving mathematical problems, as they allow for the representation and manipulation of unknown or changing values.

5 Must Know Facts For Your Next Test

1. Variables can represent unknown quantities, parameters, or values that can change within a given problem or model.
2. The use of variables allows for the generalization of mathematical concepts and the development of more versatile and applicable models.
3. In the context of modeling using variation, variables are used to represent the dependent and independent quantities that are related through a functional relationship.
4. When solving systems of equations using Gaussian elimination, variables are the unknowns that need to be determined to find the solution to the system.
5. The ability to manipulate and solve for variables is a fundamental skill in mathematics, as it enables the analysis and understanding of complex problems.

Review Questions

• Explain how variables are used in the context of modeling using variation.
  • In the context of modeling using variation, variables are used to represent the dependent and independent quantities that are related through a functional relationship. The independent variable is the quantity that can be freely chosen or manipulated, while the dependent variable is the quantity that is determined by the independent variable. By expressing the relationship between these variables using mathematical functions, models can be developed to analyze and predict the behavior of the system.
• Describe the role of variables in the process of solving systems of equations using Gaussian elimination.
  • When solving systems of equations using Gaussian elimination, variables represent the unknown quantities that need to be determined to find the solution to the system. The Gaussian elimination method involves performing a series of row operations on the system of equations to transform it into an equivalent system with a simpler form, where the values of the variables can be more easily identified. The ability to manipulate and solve for the variables is crucial in this process, as it allows for the determination of the unique solution to the system.
• Evaluate the importance of understanding variables in the broader context of mathematics and problem-solving.
  • The understanding of variables is fundamental in mathematics and problem-solving, as it enables the generalization and application of mathematical concepts. Variables allow for the representation of unknown or changing values, which is essential in modeling real-world phenomena and developing versatile mathematical tools. The ability to manipulate and solve for variables is a core skill that underpins many mathematical techniques, from solving equations to optimizing functions. Mastering the concept of variables and their role in various mathematical contexts is crucial for success in advanced mathematical studies and problem-solving.

Related terms

Constant: A constant is a value that remains fixed and does not change within a given context or problem.

Function: A function is a mathematical relationship between independent and dependent variables, where the value of the dependent variable is determined by the value of the independent variable.

Equation: An equation is a mathematical statement that expresses the equality of two expressions, often involving variables.