We have a system of equations when we have more than one equation with the same set of variables.  In order for a system to be solvable, you need one eqaution for each variable in the system.  If you have two variables, then you need two equations to solve that system.  Although it's not always the most convenient method, graphing is traditionally the first method you learn, since it clearly demonstrates the goal in solving a system; that is, to find the point of intersection.  Duration: 7:54

When it is too painful or inaccurate to solve a system of equations by graphing, you could try either substitution or elimination.  This video will review both methods and provide some valuable tips for choosing the most convenient method.  Duration: 16:03

When you have a collection of systems to solve, you first must decide which of the three methods is most convenient; that is, which method will carve a path to the solution in the easiest and most enjoyable fashion.  Let's take a look at our options for the systems in questions 62 through 65.  Duration: 11:45

In addition to solving a system of equations, the next two questions will require use to write the system first.  To do that, we will have to define a set of variables, then translate the English sentences in to mathematical equations.  After we have written our system, we will of course have to solve the system by the most convenient method.  Duration: 7:26

When simplifying square roots, your goal is to get rid of any perfect square factors under the square root symbol.  To do this, you could factor out all of your perfect square factors or plant a factor tree.  That second method is entirely eco-friendly.  Duration: 10:49

Let's say you have two numbers whose product is zero.  What does that simple fact imply about either of your two numbers?  How can we use that property to solve quadratic equations?  This brief video seeks to answer those burning questions.  Duration: 3:18