A treasure map you uncovered while vacationing on the Spanish Coast reads as follows: "If me treasure ye wants, me hoard ye'll have, just follow thee directions these. Step to the south from Brisbain's Mouth, 7 paces through the trees. Then to the west, 10 paces ye'll quest, with mud as deep as yer knees. Then 3 paces more north, and dig straight down in the Earth, and me treasure, take it please." What is the displacement vector from Brisbain's Mouth to the spot on the Earth above the treasure? Consider east the positive x direction and north the positive y direction.