What do I need to know to solve a system of equations by substitution

The video tutorial covers solving systems of equations using the substitution method. It begins with an introduction to the method, followed by understanding different types of solutions and their graphical representations. The tutorial then explains how to isolate and solve for a variable, evaluate and substitute values, and finally solve the system of equations. Key concepts include understanding systems, solutions, and the process of substitution.

Describe how to evaluate a variable once it has been isolated in an equation.

What steps should be taken to solve a system of equations using substitution?