Question

How to find a slope between two points?

Answer 1

Theres a formula for that, y2-y1/x2-x1 and thats your slope

Answer 2

Well the best way is to plug into the slope equation
$m = \frac{rise}{run} = \frac{y2 - y1}{x2 - x1}$
Where (x1, y1) and (x2,y2) are ordered pairs on the xy plane.