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(c) a two-parameter solution.

       (d) no solution.

   Solve for x, y, and z.
8.

   Find a matrix K such that             given that
9.

     How should the coefficients a, b, and c be chosen so that the system
10.

has the solution ,            , and ?

     In each part, solve the matrix equation for X.
11.

         (a)

(b)
(c)

12.
              (a) Express the equations

     and
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