Nancy went to the grocery story. On Monday she purchased 4 apples and 6 bananas for a total of $13. On Wednesday she purchased 3 apples and 7 bananas for a total of $13.50. Which system of equations represents the situation? 2 4x + y = 3 13.5x - 13y = 6 x + y = 4 x - y = 6 4x + 6y = 13 3x + 7y = 13.5 4x - 6y = 13 3x - 7y = 13.5