Skew lines are lines in three dimensions that are not parallel and do not intersect. Two skew lines may lie in parallel planes. To show that lines are skew lines; 0 Example # 1: Show that L1 and L2 are skew lines. L1 =y_-2=z_-1 and L2; x_-1=y_+3=5 3 1 1 2 1 1 Solution: Example # 2: Determine the equations of two parallel planes that contain the skew lines: Solution: Example # 3: Find parametric and symmetric equations of the line of intersection of the planes 111:3xy+4z7=0 and Jtz:x+y22+5=0 Solution