Simultaneous equations can be used to solve mathematical and real-life problems. The five steps typically followed when solving real-life problems are: 1) identify the unknown quantities, 2) choose variables to represent these quantities, 3) formulate the equations in terms of the variables, 4) solve the system of equations, and 5) check the answer to make sure it makes sense. In this section, we will learn how to apply the concept of simultaneous equations to solve mathematical and real-life problems.