There are three ways to solve systems of linear equations: by elimination (sometimes called addition), by substitution, and by creating a graphical representation. in your real-world scenario, discuss advantages and disadvantages of using each of the three ways. initial posts should include two or more variables (such as the number of boys and the number of girls) and have two or more equations involving those variables (such as there are twice as many girls as boys and that there are 33 children altogether). response posts in this option should show a solution using one of the three ways.