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16. Use an augmented coefficient matrix and elementary row operations to solve each system of equations. If the system has an infinite number of solutions, express the solution set in terms of the parameter t. a. b. C. X1 - 212 = 8 X1 - 212 = 8 X1 - 212 = 8 -3x1 + 12 = -9 -3x1 + 6.12 = 0 -2x1 + 4x2 = -162. Suppose A is a 3 x 2 matrix, B is a 2 x 3 matrix, and a is a 3 x 1 matrix. Select all the expressions which are defined. O AB BA O A+B O B + A TA OOOOO Ba TB ABT 3. Assume A = -5 -10 Find a matrix B with all non-zero entries such AB = 0. What size is the zero matrix in this case