Point K lies at (18,10) on the graph, which means that the coordinates of point LL can be found by multiplying the coordinates of point K by a constant value. Since the line KL represents a proportional relationship, the constant value must be the same for both the x-coordinate and the y-coordinate of point LL. The only choice that satisfies this condition is (7.5,13.5), since both coordinates are the result of multiplying the coordinates of point K by 0.5. Therefore, the coordinates of point LL are (7.5,13.5).