A woodworking artist makes two types of carvings: type X and type Y. He
spends 3 hours making each type X carving and 2 hours making each type Y
carving, and he can spend up to 36 hours each week making carvings. His
materials cost him $4 for each type X carving and $5 for each type Y carving,
and he must keep his weekly cost for materials to $100 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?