At finky feed store her by purchased 7 pounds of cracked corn 3 pounds of sunflower seed and 8 pounds of mixed bird seeds for $31.00 micheal purchased 5 pounds of crack corn 4 pounds of sunflower seeds and 10 pounds of mixed berry seeds for $32.75 jayleen purchased 4 pounds of sunflower seeds and 12 pounds of mixed bird seed for $27 FC represents cracked corn S represent sunflower seeds and B represents a bird see which of the systems of equations below can be used to determine the price per pound of crack corn sunflower seed in birdseed