Link objects / Scale individual parts, while others move along

Example: Two lines touch each other – –. I want to scale the left one to the right, while the right line stays the same length and moves along with the scaled line –––– –.

There is already a topic called >>>Link objects / inherit pivot point of parent?<<< from 2013.
It´s a bit old. What I learned from it is, that there is a paid addon called Bongo.
Is there something else to achieve what I want?

Thx in advance.

Hi -

You should be able to use Grasshopper to do this.