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Substitution allows you to replace an unknown with a known. Systems of Linear Equations - Solve for more than one variable. Solving Systems of Inequalities - Like before, but with less-than and greater-thans. Systems of Equations With More Than Two Variables - Why not keep going? Using FOIL...
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and The solution is then obtained by back substitution: The method above preserves the original coefficient vectors. If this is not required, then a much simpler form of the algorithm is followed by the back substitution Reference: https://en.wikipedia.org/wiki/Tridiagonal_matrix_algorithmAbout...