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# How Are Linear Equations Used?

**Linear equations are used to solve problems involving distance, speed and time, especially in transportation and travel.** They are also used to solve problems of weight, mass and density.

A linear equation is one with two expressions that are set equal to each other. It can have one or two variables, and the variables can only be raised to the power of 1. In the case of two variables in an equation, the value of one variable always depends on the value of the other variable.

A common application of linear equations is temperature conversion. In countries that use the Fahrenheit system to measure temperature, such as the United States, linear equations are used to convert temperature from Fahrenheit to Celsius. The equation of a function that converts Fahrenheit to Celsius is an example of a linear equation.

Another common application of linear equations is forex trading. Currency conversion rates are determined using linear equations in which the two currencies being exchanged are the variables in the equation. Telephone call rates are also determined using some form of linear equation. In transportation and travel, linear equations are used to determine the approximate time a journey takes if the speed remains constant.

Learn more about Algebra-
Q:
## What Is the History of Linear Equations?

A: Linear algebra originated as the study of linear equations and the relationship between a number of variables. Linear algebra specifically studies the solu... Full Answer >Filed Under: -
Q:
## When Will You Use Linear Equations in Real Life?

A: Everyday budgeting and other financial issues often use linear equations. Linear equations involve two values that change according to a consistent pattern... Full Answer >Filed Under: -
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## What Is the Difference Between Linear and Nonlinear Equations?

A: The graph of a linear equation forms a straight line, while a non-linear equation's graph does not form a straight line.Most equations can be graphed on a ... Full Answer >Filed Under: -
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## What Is a Linear Function Solver?

A: A linear function solver is software that calculates the answers to linear functional equations. The software prompts users to enter the functional equatio... Full Answer >Filed Under: