Need help my brain are hurting now

For each proportion find the unknown number x 1/5/8=×/15

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 are the solutions of the following system? y=-2x^2 y=x-2