How to solve simultaneous equations by substitution
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This video is all about how to solve a simultaneous linear equation by substitution and forms part of the playlist 'Answers to tough questions.'
It's a particularly hard math question and you might need to be aware of some of the basic principles, such as quadratic formula or equation of a circle. Like a lot of algebra math it needs to be logically thought through and you'll get extra credit for showing your working.
Solving by substitution isn't particularly common on most exams, but it's usually worth around 5 marks, so very worthwhile to practice a couple of questions - just in case!
I hope the video helps and please do leave a comment - thanks!
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