Mrs. Thomas is calculating how long it will take for her to drive to her sister's house. Her sister lives 700 miles away, and she will drive at a constant speed of 55 miles per hour. She writes the equation y=700 - 55x where y is the number of miles left to drive after x hours. Which of the following answer choices best describes Mrs. Thomas's equation?

A. Mrs. Thomas's equation is correct

B. Mr. Thomas's equation is incorrect because she switched the variables. The correct equation is x = 700y + 55

C. Mrs. Thomas's equation is incorrect because she used subtraction instead of addition. The correct equation is y = 700+ 55x

D. Mr. Thomas's equation is incorrect because she paired the variable
the wrong number. The correct equation is y = 700x - 55