For a concert event, there are $30 reserved seat tickets and $20 general admission tickets. There are 1500 reserved seats available, and fire regulations limit the number of paid ticket holders to 2800. The promoter must take in at least $61,000 in ticket sales. Find a system of inequalities describing the different numbers of tickets that can be sold. (Let x be the number of $30 tickets and y be the number of $20 tickets.) number of tickets sold