Algebra 2 Practice question?

Question

I have two questions.

1) The approximation method used to estimate a point between two

given points is called ???????????? . The

approximation method used to estimate a point lying outside the

given points is called ???????????? .

2) Find an equation of the line having slope -2 that passes through the point (1, 5) I got y - 5 = -2 ( x - 1 ) is that it?

Answer 1

2 is right but i don't understand # 1 at all

Answer 2

1)

An approximation method used to estimate a point between two given points is called an "interpolation".

An approximation method used to estimate a point lying outside the

given points is called an "extrapolation".

2)

Yes, that's the correct equation in point-slope form.  I can't read the rest of your paper, of course, so I'm not sure whether you're supposed to leave it in point-slope form.  

Answer 3

ahhhh this was in my geometry class last year and partial of my algebra 2 O_O

but i still dont know T_T is it a formula definition? o.0