Systems of simultaneous equations are intriguing.

They are used to identify points that the equations have in common (in this case, an *x* and a *y* value). Interestingly, there are a number of ways to solve equations simultaneously. The two primary methods that are first learned in middle high school are ** substitution** and

My plan (at this stage) is to address these four key methods/topics on this website.

all my questions about chain rule were answed by this video, it very helpfull to me

Thamsanqa C (on a CCM YouTube video about the Chain Rule)

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