Please help me in so confused

Can someone me with this problem . show your work .

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?