Find the solution set of the system of linear equations. Give the values of n and r,
Question:
1.
x1 + 4x2 + 3x3 - x4 = 5
x1 - x2 + x3 + 2x4 = 6
4x1 + x2 + 6x3 + 5x4 = 9
2.
x1 - 2x2 + x3 - x4 = 3
2x1 - 4x2 + x3 + x4 = 2
x1 - 2x2 - 2x3 + 3x4 = 1
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