The "Backward Equation" is a mathematical concept used to solve problems where the outcome is known, but the initial conditions or inputs are not. It involves working backward from the result to determine the original values or variables that led to that outcome. This technique is often applied in fields such as algebra and calculus. In practical applications, the Backward Equation can help in various scenarios, such as finance for calculating initial investments based on future returns or in physics for determining initial velocities from final positions. By reversing the process, one can gain insights into the relationships between different variables.