Another method of solving a system of linear equations is by substitution. In this method, we solve for one variable in one equation and substitute the result into the second equation. Free trial available at KutaSoftware.com. Problem-solving agents use atomic representations (see Chapter 2), where states of the world are considered as wholes, with no internal structure visible to the problem-solving agent. When faced with a multivariate equation, you may either wish … Read each question carefully before you begin answering it. Check your answers seem right. In the grid above, each row adds up to the number to the ….