Question

Choose the value of the y determinant (Dy) in the following system.
2x + 3y = 4
5x – y = 8

Answer 1

–17
–28
–13
–4

Answer 2

-4

Answer 3

thats simultaneous equation

Answer 4

how did you find that?

Answer 5

when you calculate the y determinant Dy, first column is consisting of coefficients at x, and second column is consisting of elements on the right side of equality sign. So it is: \[Dy=\left[\begin{matrix}2 & 4 \\ 5 &8\end{matrix}\right]\] =2*8-4*5=16-20=-4

Answer 6

thanks so much!

Answer 7

you're welcome carlyn :D