It is B. the differences are added together
Yes. Because blah blah blas blah blah blah
XD
notice, this will just be a Permutation.

you can always check your calculator also for a [ ₙPᵣ ] button.
Point slope form is:
y -

= m(x -

)
With

and

being the coordinate points, and m being the slope.
So the coordinate points are (4, -5), and the slope is -6 in this case.
So just substitute everything in, to get:
y - ( -5) = -6(x - 4)
Or
y + 5 = -6 (x - 4)
These are my notes that you can use