10) Shreya and Arjun are selling wrapping paper for a school fundraiser. Customers can buy rolls of plain wrapping paper and rolls of shiny wrapping paper. Shreya sold 14 rolls of plain wrapping
paper and 1 roll of shiny wrapping paper for a total of $138. Arjun sold 1 roll of plain wrapping
paper and 1 roll of shiny wrapping paper for a total of $21. Find the cost each of one roll of plain
wrapping paper and one roll of shiny wrapping paper.