University Games produces two types of computer games-adventure and fantasy. One adventure game requires 200hrs of time from the creative staff and 500 hrs from the tech staff. One fantasy game requires 400 hrs of time from the creative staff and 100 hrs from the tech staff. The company has 16,800 hrs of creative staff and 6,000 hr of tech staff. Formulate a system of equations to determine how many games of each type should be produced to use all staff time.