Question

Please help ASAP!!!
1. solve the system using matrices
{ x+ 2y = -1
{ -x - 3y = -2

A. [-7 ]
[3 ]
B. [3 ]
[-7]

C. [7 ]
[-3]

D. no solution

Answer 1

\[x-2y=-1 \]
\[-x-3y=-2\] now in matrix form:

by crAMER'S RULE we have:
\[\Delta =\left[\begin{matrix}1 & -2 \\ -1 & -3\end{matrix}\right]\]

\[x =\left[\begin{matrix}-1 & -2 \\ -2 & -3\end{matrix}\right]\]
\[y=\left[\begin{matrix}1 & -1 \\ -1 & -2\end{matrix}\right]\]