a woodworking artist makes two types of carvings Type X and type Y he spends 2 hours making each type X carving and 3 hours making each type y carving and he can spend up to 30 hours each week making carvings his materials cost him $6 for each type X carvings and $4 for each type y carving and he must keep his weekly cost for materials to 120 or less if x is the number of Type X carvings he makes in a week and Y is the number of type y carvings he makes in a week, which of the following systems of inequalities models this situation?