Question

Choose the value of the y determinant (Dy) in the following system.

2x – 4y = 24
2x – 3y = 15

Answer 1

\[
\begin{bmatrix}
2&-4\\
2&-3
\end{bmatrix}

\begin{bmatrix}
x\\y
\end{bmatrix}
=

\begin{bmatrix}
24\\15
\end{bmatrix}
\]

Answer 2

To get the \(y\) determinant, first swap the \(y\) column with the product column\[
\begin{bmatrix}
2&24\\
2&15
\end{bmatrix}
\]

Answer 3

Then find the determinant.

Answer 4

\[
2(15)-2(24)
\]

Answer 5

the choices are -132, -12, -18, and 78

Answer 6

I'm telling you how to do it, not the answer.

Answer 7

Learn, learn it

Answer 8

-18 is the answer

Answer 9

Did you learn how to do it?