X1 + 2x2 + X3 + 4x4 -1 0. -2 Consider the system 2x, + 4x2 + X3 + 5x4 %3D 4x1 + 8x2 + 3x3 + 13x4 (a) the system. Write down a vector equation that is equivalent to the above system. You do not need to solve (b) the system. Write down a matrix equation that is equivalent to the above system. You do not need to solve (c) operations to bring A to a row echelon form. Let A be the coefficient matrix corresponding to the above system. Use elementary row IL ||||

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