A) plug in 8 as x in the equation of the line (x-coordinate relates to length of foot): y = 1.11x - 0.83 -> y = 1.11(8) - 0.83
Simplify: y = 8.88 - 0.83 --> y = 8.05
C) The x-coordinate shows that length of the foot, so that means in the y-intercept, when x = 0, that is the length of the forearm when the length of the foot is 0 ft long (although that would not be possible, as that implies that the forearm is of negative length).
E) The slope of an equation shows y over x, which means it measures the ratio of the length of the forearm over the length of the foot (as y represents the forearm's length), or the # of inches the forearm grows for every inch the foot grows.
