HELP ME PLZ 3xy + 4x - xy + 5x - 7y

To prove "p is equal to q" using an indirect proof, what would your starting assumption be?

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

What is the result of adding the system of equations? 2x+y=4 3x-y=6