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3. Are a1, a2, a3 linearly independent? Justify 3 1 3 - 1 = -8 , -1 2 4. Describe the solutions of the following system in parametric vector form, and provide a geometric comparison with the solution set for the homogeneous system with the same coefficient matrix of the given system. x1+3x2-5x3=4 - = X1 + 4x2 - 8x3 = 7 -3x1 - 7x2 + 9x3 = 6 5. Can the columns of a 4 by 3 matrix span R4? Explain. 2

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