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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   −3x−1y+1z=9,0x−3y−2z=−10,−1x+2y−1z=5\;-3x - 1y + 1z = 9, \quad 0x - 3y - 2z = -10, \quad -1x + 2y - 1z = 5. What is yy?