Slope is related to Change. Boil is a type of Change. Boil is related to Method. 
Bill is related to Amount. Amount is related to Capacity. Capacity is related to Maximum. 
Slope <--RelatedTo--> Change <--IsA-- Boil <--RelatedTo--> Method 
Bill <--RelatedTo--> Amount <--RelatedTo--> Capacity <--RelatedTo--> Maximum 