Evaluate the given integral by making an appropriate change of variables. 10 x − 8y 8x − y dA, R where R is the parallelogram enclosed by the lines x − 8y = 0, x − 8y = 7, 8x − y = 8, and 8x − y = 10

Mason and christian go to the movie theater and purchase refreshments for their friends. mason spends a total of $45.75 on 3 bags of popcorn and 6 drinks. christian spends a total of $71.50 on 6 bags of popcorn and 4 drinks. write a system of equations that can be used to find the price of one bag of popcorn and the price of one drink. using these equations, determine and state the price of a drink, to the nearest cent.