🔍 Key Concepts

• Use the draft–displacement graph in Diagram A: vertical axis is mean draft (feet), horizontal axis is tons displacement. • Notice the straight diagonal line running from the origin; this shows a linear relationship between draft and displacement. • Pay attention to the labeled grid lines at 3 ft, 6 ft, 9 ft, 12 ft and at 1000, 2000, 3000, 4000 tons.

💭 Think About

• Start at the 6‑foot mark on the mean draft (vertical) axis and move horizontally until you hit the diagonal line. What horizontal position does that intersection line up with on the tons scale? • Compare the pattern of points where the diagonal crosses other labeled drafts (3 ft, 9 ft, 12 ft). What displacements do those correspond to? Is there a simple ratio you can see? • If draft and displacement change in direct proportion, how many feet of draft increase correspond to each additional 1000 tons?

✅ Before You Answer

• Make sure you are reading draft on the vertical axis and displacement on the horizontal axis, not the other way around. • Confirm the point where the 6‑ft horizontal line meets the diagonal, then drop a line straight down to the displacement scale to avoid misreading the grid. • Check that your chosen answer fits the same pattern as the other obvious points on the line (e.g., at 3 ft and 12 ft).