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College Algebra

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Please help!

x-2y+z=7
2x+y-z=0
3x+2y-2z=-2

a. Solve the above system of equations using Gaussian Elimination or Gauss-Jordan Elimination. You must show row operations.

b. Solve the above system of equations using Cramer's Rule.

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    its a simple matrix problem. ti-89 does it for you.

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    This is my problem
    I need help with.
    (7,-8); 3x+5y=6

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    {7x+4y=11
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