I am struggling to understand how to sum the two graph together.

can you simplify the answer in steps..

1- ?

2- ?

3-?

Fred and Frank are vacationing dog owners. Each owns two dogs which he would like to leave behind at the Pampered Pets Resort while he travels. The graphs below depict their individual demand curves for dog babysitting services. FRED'S DEMAND PRICE PER NIGHT PER DOG $40 530 $20 $10 2 3 QUANTITY OF DOGS FRANK'S DEMAND PRICE PER NIGHT PER DOG $40 $30 $20 $10 2 co. QUANTITY OF DOGS Which of the following graphs depicts the total demand for Pampered Pets Resort's services by Fred and Frank?PRICE PER NIGHT PER DOG $40 $30 $40 $10 PRICE PER NIGHT PER DOG $60 $50 $20 $30 $20 0- 3 5 QUANTITY OF DOGS $10 3 QUANTITY OF DOGS O Graph 1 O Graph 2 At a price of $20, all four dogs This graph is the vertical sum of the would be boarded at the two demand curves. To obtain an Pampered Pets Resort. This graph accurate combined demand curve, indicates that only three would. the two individual curves should be summed horizontally. PRICE PER NIGHT PER DOG $40 $40 $30 $20 PRICE PER NIGHT PER DOG $30 $20 $10 $10 2 3 5 6 QUANTITY OF DOGS 3 5 QUANTITY OF DOGS O Graph 3 O Graph 4 This graph indicates that there To obtain the total demand from the would be demand for 4.5 dogs to two customers, simply sum the two be babysat at a price of $10. 1/2 of demand curves horizontally. a dog would be an odd quantity to babysit