A fly lights on the edge of an 18 ×12-inch picture frame and is x units away from a bottom corner, as designated by the star on the diagram. Which function describes how far the fly is from the top left corner?

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A fly lights on the edge of an 18 ×12-inch picture frame and is x units away from a bottom corner, as designated by the star on the diagram. Which function describes how far the fly is from the top left corner?<br><img src='https://www.fatskills.com/images2/GradExams/K12MATH012-80.png' height='75' width='138'/>