At a restaurant, there are different appetizers on the menu: spring rolls, chicken tenders, and pretzel dippers. One group buys 2 plates of chicken tenders and 1 plate of pretzel dippers, and spends $23 on appetizers. Another group spends $30.75 to buy 3 plates of spring rolls and a plate of chicken tenders. A third group buys one of each appetizer, spending $22.25 on appetizers. How much does a plate of spring rolls cost.