ADVANCED MATH (You may use excel for solving. Rate will be given.) See the following system of equations:  2x - 6y - 4 = -5 2x - 10y - 9z = -5 -x + 6y + 5z = 3   Using the L-U decomposition, identify matrices L, U and y from the given equations. Answer in fractional form:   Matrix U (Put the computed values

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