1. For each of the following, give two equivalent statements that will guarantee that a. A system of linear equations Ax = b will have a unique solution for any choice of b. b. A homogeneous system Ax = 0 will have a nontrivial solution. 2. Solve the following systems of equations using the Gaussian or Gauss-Jordan elimination method. a. 4x +9y = 8 8x + 6z = -1 бу +62 = -1 b. x₁2x₂ + x3 x4 = 0 2x₁4x2 + x3 + x4 = 0 x₁2x22x3 + 3x4 = 0

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