Linear Algebra@Chapter 1

The notes begin at Solution set of linear system.

The concept to start this topic is free variablerow operation and span, 1.1 to 1.4 in the book "linear algebra and its applications 4th edition"

"span" : generally means can be solved by

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save your life by using http://www.wolframalpha.com/ to solve the matrix

format : row reduce {{row1},{row2}...}

example:

row reduce {{4,6,-7,3,-5},{-7,-8,10,-5,6},{3,5,-8,4,-6},{7,12,-9,2,-7},{5,-8,14,-6,3}}

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