Blake is throwing a party and needs to buy supplies to make guacamole. He bought 6 avocados and 3 limes for 11.55 at the first store. He purchased 3 more avocados and 5 more limes for 7.00 at the second store. Which system can Blake use to figure out how much he paid for each avocado and each lime? Assume that x represents the price of each avocado and y represents the cost of each lime.