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# PM2 - FIRST EXAM-A Instructions Begin each of the eight...

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FIRST EXAM-A Instructions: Begin each of the eight numbered problems on a new page in your answer book. Show your work, and mention theorems when appropriate . 1. [15 Pts] Find the general solution of the following homogeneous system of equations. Express your answer using vector notation. Use the method developed in class. What is an appropriate (mental) geometric picture for this solution set? ± x 1 3 x 2 9 x 3 +5 x 4 =0 x 2 +2 x 3 x 4 2. [15] Determine which of the following sets of vectors are linearly independent. Give reasons for your answers. a. 10 6 2 , 5 3 1 b. 1 2 1 , 0 0 0 , 3 5 4 c. 1 1 0 1 , 2 1 3 5 , 1 1 2 3 , 0 9 4 4 3. [15] Let A = 11 2 1 1 3 , y = 2 7 4 , and de±ne T : R 2 R 3 by T ( x )= A x .
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