Domain of the image above find it plz

Triangle xyz has vertices x(1,3), y(0,0)

How can constraints be used to model a real-world situation?

The john nash mall used 17,4000 kilowatt hours in may, with a peak load of 92 kilowatts. the demand charge is $5.95 per kilowatt, and the energy charge is $0.08 per kilowatt hour. the fuel adjustment charge is $0.017 per kilowatt hour. what is the total electricity cost for may?