haha no problem.
For the second one, take two points, for instance check the attatchment.
It is advised that you select points from over more than half of the line.
I took, (1.1, 3) & (2.8, 8.4)
m = y2 - y1 / x2 - x1
= 8.4 - 3 / 2.8 - 1.1
= 3.18 x10^3
I believe CIE always gives and a range of values, though I'm pretty much not sure about edexcel.