A map of the local playground can be represented on the coordinate plane below. The swings are located at ( 5 , 7 ) , the slide is located at ( 2 , − 4 ) , and the sandbox is located at ( 0 , 5 ) . Karen left the swings and walked 3 yards west and 2 yards south. Eva left the sandbox and walked 5 yards east and 4 yards north. If each square of the coordinate plane is equal to one square yard, how many yards north of the swings is Eva located?