Ulysses sold umbrellas for $25 each and raincoats for $50 each. He earned a total of $600 from selling these items. Let x be the number of umbrellas Ulysses sold and y be the number of raincoats. The system of equations that models this scenario is: 25x+50y=600 x plus y is equal to 18 How many umbrellas and raincoats did Ulysses sell?