Slope is rise over run. It would have infinite rise over 0 run, but you can't divide by 0, making it an undefined slope.
<span>Parchment The Declaration of Independence is written on vellum parchment, which is made from sheepskin and written in Iron Gall Ink.</span>
C. A union citizen opposed to fighting the war
They taxed traders coming and leaving Ghana, and they used their armies to protect trade routes.