Unformatted text preview: and 16 out of 20. The unoﬃcial scale is: A’s 5460, B’s 4853, C’s 4247, D’s 3641. 1) I meant to draw in a vertical line after column 6, but it’s not really important (see Ch 1.2 problem 1) and this didn’t seem to bother anyone. Answer: 1 2 3 4 5 1 4 6 1 7 2) TFFFT 3) Since it is underdetermined, there are more variables than the number of equations, which is the maximum number of lead variables. So, there is a free variable, and inﬁnitely many solutions. You cannot justify statement 2e with an example, because it says ” Every ...”. Somehow, a few people who answered ”False” gave a pretty good discussion [even with the wrong conclusion], and I gave them a little partial credit. But this is very unusual. 1...
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 Spring '09
 JULIANEDWARDS
 Gaussian Elimination, Prof. S. Hudson, lead variables

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