Question

matrices

Answer 1

\[x_1+2x_2+x_3=5\]
\[4x_1+7x_2+8x_3=9\]
\[2x_1+3x_2+5x_3=1\]
a) write the system in a matrix multiplication AX=Y

Answer 2

is it \[\left[\begin{matrix}1 & 2 &1\\ 4 & 7& 8\end{matrix}\right]\left[\begin{matrix}x_1 \\ x_n\end{matrix}\right]=\left[\begin{matrix}5 \\ 9\\1\end{matrix}\right]\]

Answer 3

hmm you missed one rown in the end in the A matrix.

Answer 4

@Jonask

Answer 5

\[\left[\begin{matrix}1 & 2 &1\\ 4 & 7& 8\\2&3&5\end{matrix}\right]\left[\begin{matrix}x_1 \\ x_2\\x_3\end{matrix}\right]=\left[\begin{matrix}5 \\ 9\\1\end{matrix}\right]\]

Answer 6

oh yes thank you how do we find the
det(A)
Adj(A)