When you are given multiple equations and multiple variables, a graphing calculator can be a lifesaver. Since the introduction of OS 2.0 on the TI-nspire, this is something you can do easily on your calculator. This video lesson review the “elimination” or “linear-combination” method before going on to explain how to solve these problems on your nspire. If you don’t yet have OS 2.0, you’ll need to get it for this lesson.
If you’re a student of geometry or trigonometry, you’ve probably come across problems involving degrees, minutes, and seconds. This is an alternative to measuring in decimal degrees, and it works a lot like time. The conversion rates are: 1 degree = 60 minutes 1 minute = 60 seconds. As a result, 1 degree = 3,600 seconds. If you want to convert from degrees, minutes, seconds to decimal degrees, you can divide by 60 and 3600 for minutes and seconds respectively.
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