Question

How do you find a slope of a line using only two points??

Answer 1

Its the difference between the y- values divided by the distance between the corresponding x values. Or  its sometimes called rise / run.

Answer 2

The formula to use is :
$\frac{ y_{2}-y_{1} }{x_{2}-x_{1}}$
where the two coordinates are in the format (x1, y1) and (x2, y2)