# What is the slope of the line passing through the following points:  (1,5) ; (-8,8)?

$m = - \frac{1}{3}$
$m = \frac{{y}_{1} - {y}_{2}}{{x}_{1} - {x}_{2}}$
m=(5-8)/[(1-(-8))
$m = - \frac{3}{9}$
$m = - \frac{1}{3}$