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21-241: Matrix Algebra { Summer I, 2006 Practice Exam 2
www.math.cmu.eduReplacing b1;b2 by 2, ¡6 respectively in the echelon form we obtained above, we can write out the solution y = (6 ; 4) T . This is to say, x = 6u 1 + 4u 2 , so the coordinate