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MIT 18.06 Linear Algebra, Spring 2010 9 Online
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?

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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