Question

Choose the value of the x determinant (Dx) in the system.
3x – 7y = 11
2x + 5y = –4

Answer 1

I have never heard the term before, but after looking it up it seems to be the coefficient matrix\[A=\left[\begin{matrix}3 & -7 \\ 2 & 5\end{matrix}\right]\]with the solution vector\[\left(\begin{matrix}11 \\ -4\end{matrix}\right)\]replacing the first column.

Replacing the second column of A by the solution vector would give you Dy.

Answer 2

You want the determinant of the matrix I described above.

Answer 3

thanks