2. Use Gauss or Gauss-Jordan elimination to find for what values of k the following systems of equations have (i) no solution, (i) infinitely many solutions, (ii) a unique solution. Write down the solutions, when they exist. (a) x+y +2 z = 1 x + 3 y + k z = -1 +k z =k+ 2 (b) X + 2y + 2z = 0 kx+3 ky + 5z = 0

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