Solving Systems of Linear Equations by Elimination

Here is one of the things I have been working on for the upcoming year. Using my Poor Man's Interactive White Board I want to record the examples I do in the classroom (and other examples when I will be away). The plan is to record it using the SmartBoard software and to include audio with my example. I think that examples are much more powerful when you see and hear how the question is done. Reading a written example can get quite confusing. This is one of my solutions to having to do the same example 3 or 4 times for students who are either ahead, behind, or absent.

This video (a third attempt) is my first example. Unfortunatly the audio came out quite poorly. I can't understand what I was saying - and I said it! I am using a Motorola H500 Bluetooth headset (one of those little ear clip deals). I will continue to monkey with the settings but if anybody has any tips as to how to tweak the audio let me know.