The best option is first graph. The graph clearly shows the relationship between a dog's weight and the antibiotic dosage used to treat the dog.
What is graph?
A graph is "diagrammatic or pictorial representation of the collection of data in organized manner."
According to the question,
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 50mg of antibiotic per dose.
The horizontal line in the graph represents the dog's weight in (l b) and the vertical line in the graph represents the amount of dosage is used for treatment for bacterial infection of the dog.
Every increase of ten pounds is an increase in 50 mg dosage of treatment, and it should start at 0 in the graph.
Hence, the best option is first graph. The graph clearly shows the relationship between a dog's weight and the antibiotic dosage used to treat the dog.
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