Final answer:
If x and y are parallel lines and y and z are parallel lines, then x and z will also be parallel lines.
Step-by-step explanation:
If x || y and y || z, then x || z. This means that if x and y are parallel and y and z are parallel, then x and z are also parallel. Parallel lines are lines that never intersect and have the same slope. Therefore, if both x and y have the same slope, and y and z have the same slope, then x and z will also have the same slope, making them parallel.