When buying snacks for her classroom, Ms. Davis bought 4 bags of mixed nuts and 8 bags of pretzels. A bag of pretzels costs $1.50 less than a bag of mixed nuts. She spent $57 for the snacks. The diagram represents the scenario. 2 tables. Table 1 has 4 columns labeled nuts with entry n. Table 2 has 8 columns labeled pretzels with entry n minus 1.50.

Which equation represents the scenario?