Find slope

m = \frac{y _{2} - y _{1}}{x _{2} - x _{1}}

Work through it

$m = \frac{8 - 2}{3 - 1} = \frac{6}{2} = 3$

$m = \frac{0 - 4}{2 - 0} = - 2$

A negative slope falls from left to right.

$m = \frac{3 - 1}{8 - 2}$

Rise goes on top. Use the difference in $y$ over the difference in $x$ .

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