Question

Choose the value of the coefficient determinant (D) in the following system.

2x – 5y = –2
x – 3y = 0

Answer 1

To find the determinant, you first need to place the coefficients in a matrix.
\[\left[\begin{matrix}2 & -5 \\ 1 & -3\end{matrix}\right]\]

Then, the determinant is given by multiplying along the diagonal down and right, then subtracting the product found by multiplying along the diagonal up and right.

So, (2)(-3)-(1)(-5)=-1.

Answer 2

ohhh ok. thank you very much ;]