octors work with various substances in their practice For example rubbing alcohol is used as an antiseptic For example nurses use a 70 alcohol solution as an antiseptic before giving an injection but will not use a 90 solution The reason being is a 90 alcohol solution is too strong and will coagulate the protein in contact and change the state of the protein Sometimes 40 alcohol solutions are used Nurses and doctors must use a system of equations to create their own mixture to fit their needs SE 2 The nurse has Mixture X a 20 alcohol solution and Mixture B a 100 alcohol solution but the nurse needs 15 liters of a 40 alcohol solution how should the nurse solve this problem The nurse can solve this problem by using a system of equations The system of equations 20x y 15 represents this situation where x is the number of liters of Mixture X and y is the number of liters in Mixture Y How many liters does the nurse need from Mixture X How many liters does the nurse need from Mixture Y