Question: Stretching slope fields

I'm interested in finding a command that could stretch slope fields for me. Or perhaps I need to make a procedure of my own?

If that is the case, I would like to know how to draw a segment of a graph by varying the slope.

I think it is possible for me to use


segment([y=y'*x+C, [x,y]],a,b);

But I don't have any idea how to make a program out of it yet.


Thanks in advance :)

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