Decide Whether the Matrices Are Inverses of Each Other $$\begin{aligned}1.5 x+3.1 y-2.3 z+0.6 w &=2.7 \\6.1 x-0.5 z-3.4 w &=0.8 \\11.5 y-2.2 w &=0 \\4.0 x+3.0 y-2.1 z &=9\end{aligned}$$

Multiple Choice

Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
- $$\begin{aligned}1.5 x+3.1 y-2.3 z+0.6 w &=2.7 \\6.1 x-0.5 z-3.4 w &=0.8 \\11.5 y-2.2 w &=0 \\4.0 x+3.0 y-2.1 z &=9\end{aligned}$$

A) $(7.9,2.4,9.0,12.3)$
B) $(3.6,1.1,4.1,5.6)$
C) $(3.2,1.0,3.7,5.0)$
D) $(4.3,1.3,4.9,6.7)$