# How do you set up and solve the following system using augmented matrices 2x+3y+4z=20, 3x+4y+2z=17, 3x+2y+3z=16?

$x = 1 , y = 2$ & $z = 3$
3. Find $\left({A}^{-} 1\right)$ using formula ${A}^{-} 1 = \left(\frac{1}{|} A |\right) \left(A \mathrm{dj} . A\right)$