Explicit equations are mathematical expressions that clearly define a relationship between variables. In these equations, one variable is expressed directly in terms of others, allowing for straightforward calculations. For example, in the equation y = 2x + 3, y is explicitly defined based on the value of x. These equations are commonly used in various fields, including algebra, physics, and economics, to model relationships and predict outcomes. By providing a clear formula, explicit equations make it easier to understand how changes in one variable affect another, facilitating analysis and problem-solving.