Question

-50 POINTS- please help

Answer 1

Answer:

-13

-10

Step-by-step explanation:

A x = B

To find X

A ^ -1 A  x = A ^ -1 B

x = A^ -1 B

x = -3/2  -5/2      2

     -1       -2         4

Across times down

-3/2 * 2 + -5/2 *4 = -13

-1 *2 -2 * 4 = -10

The matrix is

-13

-10

Answer 2

Answer:

$\Large \boxed{\bold{D.} \ \left[\begin{array}{ccc}-13\\ -10\end{array}\right]}$

Step-by-step explanation:

$AX=B$

To find $X$

$X=A^{-1} \cdot B$

$\displaystyle \left[\begin{array}{ccc}-\frac{3}{2} \cdot 2 + - \frac{5}{2} \cdot 4\\ -1 \cdot 2 + -2 \cdot 4\end{array}\right]$

$\displaystyle \left[\begin{array}{ccc}-3 + - 10\\ -2 + -8\end{array}\right]$

$\displaystyle \left[\begin{array}{ccc}-13\\ -10\end{array}\right]$