Pls help me**will give brainlest answer**

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

When y’all answer can y’all explain too !

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10