Consider the matrix below for items 4.1 to 5: =1/1₁ B = 0 4.1 B is a/an 4.2 Calculate the determinant of B. 5. If it exists, calculate the inverse of B. triangular matrix. 0 1 L3 0 0

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A: 9. Given the set of equations                     x-2y=5, 3x+y=15.