Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
-$ \left[\begin{array}{ll}-5 & 1 \ -7 & 1\end{array}\right] $ and $ \left[\begin{array}{cc}\frac{1}{2} & -\frac{1}{2} \ \frac{7}{2} & -\frac{5}{2}\end{array}\right] $

Question

Quizplus · Accepted Answer

Multiplying the two matrices together yields the identity matrix $I = \left[\begin{array}{cc}1 & 0 \ 0 & 1\end{array}\right]$, confirming they are inverses of each other.

Decide Whether the Matrices Are Inverses of Each Other [−51−71] \left[\begin{array}{ll}-5 & 1 \\ -7 & 1\end{array}\right] [−5−7​11​]

Decide Whether the Matrices Are Inverses of Each Other $\left[\begin{array}{ll}-5 & 1 \\ -7 & 1\end{array}\right]$