Question

What is the determinant of the coefficient matrix of this system?

Answer 1

So what will our coefficient matrix look like?

Answer 2

The 2nd row is incorrect, you have a 1 in the y-term...however the equation has no 'y'...so it would just be a 0 right?

Answer 3

So we have

\[\left[\begin{matrix}2 & 3 & 1 \\ 1 & 0 & 1 \\ 1 & 2 & -1\end{matrix}\right]\]

So now, how did you get a 4? what did you do?

Answer 4

Sorry openstudy lagging for me

And yeah 4 is correct I just like to see work, but great job