Line jk contains points j (4, 3) and k (1, 5). line lm contains points l (2, 3) and m (-1, 5). lines jk and lm are . a. parallel. b. perpendicular. c. neither

To determine the relationship of the lines, determine their slopes through the equation,
                                      m = (y2 - y1) / (x2 - x1)

Line 1                            m = (5 - 3) / (1 - 4) = -2/3
Line 2                            m = (5 - 3) / (-1 - 2) = -2/3

The slopes are equal. Thus, these lines are parallel.