Help I’m desperate it’s due tomorrow:(

Use the distributive law to multiply. 3(4x + 5y + 6)

Having a hard time understanding this question (see attachment).

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.