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MIT 18.06 Linear Algebra, Spring 2010
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OpenStudy (anonymous):
"Introduction to Linear Algebra", Strang. Worked example 2.1 B (1) says "add" to get 0=1 but the last equation is actually subtracted from the other two. Why?
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OpenStudy (phi):
can you post a photo or scan ? It may be a typo?
OpenStudy (anonymous):
There is a multiplication first by 1, 1, and -1, so all the quotients change sign in the third equation. An addition of a negative number is effectively a subtraction.
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