PLEASE HELP 100 POINTS BUT ANSWER EVERYTHING PLEASE

How do you solving the solution of each system using elimination?

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?

Indicate the formula for the following conditions: p^c(n,r)=