Question

How do i find the values of the variables in this matrix?

Answer 1

file is attached in post above ^^^^ 5.png

Answer 2

15 + 8x = 30
solve for x

Answer 3

I used determinant rules

Answer 4

seriously? that was it?

Answer 5

I assume that it has taken the determinant of the matrix, in which case for a matrix \[\det \left[\begin{matrix}a & b \\ c & d\end{matrix}\right] = ad-bc\] so youwould have 15+8x=30, giving x=15/8

Answer 6

yeah x = 15/8

Answer 7

thanks guys!

Answer 8

what about this one?