Yes as long as you are not a stright line.

Yes, but you need two points to figure out the slope first.

Yes, but I would recommend a curve.

You can!

Question: are you straight?

My calculater returned "undefined" D:

Just turn around, now you see it's an uphill struggle :D

Huh. It is entry level. People have developed the whole Mathematic science only to measure that! Nowadays we have Machine Learning. We have Bayesian Inference. We have Neural networks. Check these! Deep Learning

I would suggest you use y = b x^2 + c x +d instead

Of course just make a graph out of the data

Be careful about your coordinate system. Which direction is the vector Y pointing?

I don't think so but you can give it a try.

You lose your time to find 82 question... I think your life is yet at 0

only if m<0

Thank you very much, Witte