Please answer will mark brainliest

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Two numbers have a sum of -19. one number is x. what expression represents the other number?

Afarmer has decided to divide his land area in half in order to plant soy and corn. calculate the area of the entire area so he knows how much soil is needed. each bag of soil covers 20 square yards. how many bags should the farmer purchase? (4 points) 1 bag 2 bags 3 bags 4 bags