Given a homogeneous system Ax = 0 of (scalar) linear equations,  we say that a subset of these equations is irredundant  provided that the corresponding column vectors of the transpose  A^T are linearly independent. In Problems 21–24, extract  from each given system a maximal subset of irredundant equations. 

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X1 + 2х2 - x3 + 2x4 = 0 X2 + 3x3 + 3x1 X4 = 0 5x1 + 3x2 + x3 + 5x4 = 0 + 5x3 + 4x4 = 0 2х1