which line is perpendicular to - 4x + y = 5?

Amuseum is building a scale model of sue, the largest tyrannosaurus rex skeleton ever found. sue was 13 feet tall and 40 feet long, and her skull had a length of 5 feet. if the length of the museum's scale model skull is 3 feet, 1.5 inches, what is the difference between the scale model's length and its height? a) 8 feet, 1.5 inches b) 16 feet, 10.5 inches c) 22 feet, 6.5 inches d) 27 feet, 4 inches