An explicit equation is a mathematical expression that clearly defines a relationship between variables. In this type of equation, one variable is expressed directly in terms of another, allowing for straightforward calculations. For example, in the equation y = 2x + 3, y is explicitly defined based on the value of x. Explicit equations are commonly used in various fields, including algebra and calculus. They provide a clear formula for predicting outcomes and understanding relationships between quantities. This clarity makes explicit equations essential tools in both academic and practical applications, such as in science and engineering.