Use Cramer's rule to find yyy in the system: {2x+y+z=5x−y+2z=33x+2y−z=4\begin{cases} 2x + y + z = 5 \\ x - y + 2z = 3 \\ 3x + 2y - z = 4 \end{cases}⎩⎨⎧2x+y+z=5x−y+2z=33x+2y−z=4
314\frac{3}{14}143
−314\frac{-3}{14}14−3
914\frac{9}{14}149
−914\frac{-9}{14}14−9