Question

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

Answer 1

are there choices

Answer 2

17
39
28
-2

Answer 3

@bman123

Answer 4

what do you mean by y [dy] for the set of eq. ??

Answer 5

hey @FlyinSolo_424

Answer 6

oh sorry. and like d (little y) instead of ^y it would be the other way

Answer 7

@exploringphysics

Answer 8

list the coefficients without the \(y\) you get
\[3,7\]\[2,4\] then \(D_y=3\times 4-7\times 2\) if i remember correctly

Answer 9

im confused @satellite73

Answer 10

did you see how i got this
\[3,7\]\[2,4\]?

Answer 11

[3 7]
[2 4] id required one can you solve this ?

Answer 12

We start out with the system:\[
\begin{array}{cccc}
3x &–& y &=& 7 \\
2x &+& 5y &=& 4

\end{array}
\]
We have our matrix by taking coefficients: \[
\begin{bmatrix}
3&-1\\
2&5
\end{bmatrix}
\]We have our answer column: \[
\begin{bmatrix}
7\\4
\end{bmatrix}
\]We replace the y column with the answer column:\[
\begin{bmatrix}
3&7\\
2&4
\end{bmatrix}
\]Then we find the determinant:\[
3\times 4 - 7 \times 2
\]