7. 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 \( y=700-55 x \) 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? Mrs. Thomas's equation is correct. Mrs. Thomas's equation is incorrect because she paired the variable \( x \) with the wrong number. The corrent equation is \( y=700 x \) - 55 . Mrs. Thomas's equation is incorrect because she switched the variables. The correct equation is \( x=700 y+55 \). Mrs. Thomas's equation is incorrect because she used subtraction instead of addition. The correct equation isy \( =700+55 x \).
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