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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   4x+0y+1z=17,3x+4y+1z=16,−2x+0y−1z=−7\;4x + 0y + 1z = 17, \quad 3x + 4y + 1z = 16, \quad -2x + 0y - 1z = -7. What is yy?