A veterinarian uses a specific formula to calculate the dosage of an antibiotic given to dogs with bacterial infections. For each 10 pounds of a dog's weight, s

A veterinarian uses a specific formula to calculate the dosage of an antibiotic given
to dogs with bacterial infections. For each 10 pounds of a dog's weight, she treats
the dog with 50 mg of antibiotic per dose. Which of the following graphs describes
the relationship between a dog's weight and the antibiotic dosage used to treat it?