what is meant by-non proportional linear relationship?

Answer 1

That is an idiotic term invented by math teachers.

Here are examples...

y=3x is a linear equation, proportional.

y=3x-2 is a linear equation, non-proportional.

any linear equation is of the form
y=mx+b

When b is zero, it is a proportional linear equation.
When b is nonzero, it is a "non-proportional" linear equation according to that thinking.

Shakespear wrote Much Ado about nothing, as I recall, but is being reformed here.

Answer 2

Loved your response!

I always followed one of the sayings of Albert Einstein, who, loosely stated, said

"Everything should be made as simple as possible, but ...
not too simple."