I really need help right now

Show me how you find y and determine what y is you i appreciate it : )

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two