Answer:
6
Step-by-step explanation:
6 is a multiple of three with only itself
➡3x - ( 7 over 12)
➡ [12 (3x ) - 7 ] over 12
➡ ( 36x - 7 ) over 12
When put in matrix form, the coefficients of
... 3x -2y = 7
... x + 4y = 2
look like
![\left[\begin{array}{cc}3&-2\\1&4\end{array}\right]](https://tex.z-dn.net/?f=%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D3%26-2%5C%5C1%264%5Cend%7Barray%7D%5Cright%5D%20%20)
The determinant is 3×4 - 1×(-2) = 14.
The answer is 5 x -3 + 4 x 2 / 2 = -15 + 8 / 2 = -11
I think your question is asking how much money he owes. He owes $90