30 points - which do i graph first?

What is the solution of the systems of equations? y=2/3x+3 x=-2

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?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base