Harry reads equal numbers of pages of a book every week. The graph shows the number of pages of the book left to read, y, after x weeks: A graph titled Harry’s Book Reading shows Number of Weeks on the x-axis and Number of Pages Left on the y-axis. The scale on the x-axis shows numbers from 0 to 6 at increments of 1, and the scale on the y-axis shows numbers from 0 to 385 at increments of 55. A straight line joins the ordered pairs 0, 275 and 1, 220 and 2, 165 and 3, 110 and 4, 55 and 5, 0. Which equation best models the relationship between x and y? y = −5x + 55 y = −55x + 385 y = −5x + 275 y = −55x + 275