Whenever you sign a lease for an apartment, you typically have to pay a security deposit before you even move in; this is in case something happens while you are occupying the apartment and repairs have to be made. One apartment building has apartments that rent for $900 a month and a security deposit of $600. Write an equation to represent the situation described. F( x) = 900 x + 600
F( x) = 600 x - 900
F( x) = 900 x - 600
F( x) = 600 x + 900