You connect the points (0, 0) and (9, 6) with a line segment. Starting at (0, 0), you move $\frac{1}{3}$ of the way along the segment. What is the sum of the coordinates of the point you land upon?
1/3 of the way from 0 to 9 is 3 = x
1/3 of the way from0 to 6 is 2 = y sum = 5