Unformatted text preview: Roughly, A’s = 55 to 60, B’s = 49 to 54, C’s = 43 to 48, D’s = 37 to 42. This is just an advisory (unoﬃcial) scale; I’ll give you more info on the scale as the term goes on, and decide on the oﬃcial scale after the ﬁnal exam. 1) The solution set is S = { (3α, α,2) } . You should use this same notation, or something pretty close. I suggest checking your answer (eg set α = 0 and check that (3,0,2) works. Then maybe α = 1). The RREF (without the vertical line) is: ± 1 1 0 3 0 0 12 ² 2) The traﬃc diagram was on the board and had only two intersections. The ﬁrst showed IN = x 1 + 230, and OUT = 150 + x 2 . So, the ﬁrst equation is x 1x 2 =80. Similarly, the second simpliﬁes to x 2 = 130. So, x 1 = 50. You can stop there (you’ve solved it), or you can write S = { (50 , 130) } , using the notation of problem 1. 3) FFTFT 1...
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 Spring '09
 JULIANEDWARDS
 Gaussian Elimination, Row echelon form, Prof. S. Hudson, traﬃc ﬂow diagram

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