depending on what the criteria for real world examples is it can be anything from a rocket to a Golf club swinging and hitting a gold ball which in turns makes the golf ball go flying
Judith Kay Newton
In my openion bubbles in the soap film is the real examples of it.
You reading this answer.
Carin and machines
Since it is in one dimension, you add as you add real numbers, either 10 + (-20) (if you call east positive), or -10 + 20 (if you call west positive).
in the real world
Roads are an example of intersecting lines in the real world.
Scales or balances.
l
The Grand Canyon.
A Jarlid
McDonalds Arches
Balls
On Batman(donnanonanon!)
normal_distribution
rl = real life.
Did you mean "real world examples of parallel lines"? If so, railroad tracks are a perfect example.