Helping in using linear fitting

[Norah]

Hi everybody,
I hope to find someone can help me,

What are the equations of linear fitting?

Are my equations right?

n.Er + R-$$\sum$$I =$$\sum$$V

$$\sum$$I.Er + R $$\sum$$(I.I) =$$\sum$$(IV)

Please help me I need it today.

If there is any website can help me please put it here

 

[tiny-tim]

Welcome to PF!

What are the equations of linear fitting?

Are my equations right?

n.Er + R-$$\sum$$I =$$\sum$$V

$$\sum$$I.Er + R $$\sum$$(I.I) =$$\sum$$(IV)

Hi Norah! Welcome to PF!

I'm confused … linear fitting of what?

What branch of maths or physics is this from?