What are you doing step-bro!?

It says factor each expression completely 8y+48

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.

Determine which postulate or theorem can be used to prove that lmn =nmo