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Find the total area for the regular pyramid ( follow the answer set up in the picture)

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?  

X+ y = 5 ; x - y =3 solve using linear combination