X+y+z+w=5 x+2y-z-2w=-1 x-3y-3z-w=-1 2x-y+2z-w=-2

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.