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Applied Finite Mathematics HW Solutions 43

Applied Finite Mathematics HW Solutions 43 - 12 13 14...

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Unformatted text preview: 12' 13. 14. EXERCISES 3.4 . ‘ ' 41 We present a sequence of elementary row operations that lead to a row echelon form for the augmented matrix of the given system. You may, however, use a different sequence of operations, resulting in a different row echelon form. The solution of the system, however, must be the same. 3 2 —4 0 R1 —|- R3 1 1 0 1 1 3 0 —i 1 1 3 1 1 0 0 R3 —r R, 3 2 —-4 0 0 R2_"_R1+R’Z 0 R3—i—3R1+R3 1 1 0 0 1 1 0 0 Hue-003ORg—i—R3—>0140 0a1u40R3—»R2/3 0010 We now convert this augmented matrix to an equivalent system of equations, m+y=m y+4z=0, 220. When we substitute 2 = 0 into the second equation, we obtain 3; = 0. When we substitute 3; = 0 and z = 0 into the first equation. we find .1: = 0 aISo. We present a sequence of elementary row operations that lead to a rowr echelon form for the augmented matrix of the given system. You may, however, use a different sequence of operations, resulting in a different row echelon form. The solution of the system, however, must be the same. 1 —1 2 0 1 m1 2 0 3 1 —4 0 R2 —r —3R1 + R2 —l 0 4 —10 0 2 2 wii 0 0 4 —10 0 R3 —) —R2 + Rs Rs—t—QRH‘Rs 1 —1 2 0 1 —1 2 0 --—+ O 4 --10 U Rz—iRQ/fli --—+ 0 1 —5/2 0 0 0 0 0 0 0 0 0 - We now convert this augmented matrix to an equivalent system of equations, a: — y + 22: 2 0, — a; — 0 y 2. '_ ‘ When we solve the second equation for y, we get 3; = gz. When we substitute this into the first equation, we obtain 5 z $—§Z+22§—0 => $——-§. Thus, there is an infinity of solutions for the system a: = 3;, y = %, z arbitrary. We present a sequence of elementary row operations that lead to 'a row echelon form for the augmented matrix of the given system. You may, however, use a different sequence of operations, resulting in a different rowr echelon form. The solution of the system, however, must be the same. 3 1 —1 0 R1 —) R2 1 —2 3 1 —2 3 0 R2 —) R; —i 3 1 —1 5 H3 5 0 5 _3 5 0 0 Rem—3R1+R2 0 Has—salun a -____l.:l_f‘__l ...
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