Find an expression that is equivalent.

Ineed with number 6 , explain how to get 1978

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.

Free points also plz look my profile and answer really stuff