-8 - 5 = -13
_____ ___
-5 + 5 = 0
So there is no slope because it’s a vertical line. It stays on the x-axis since there was no change in x-values.
The equation would simply be x=-5, and there is no slope.
The equation for slope formula is
(y2-y1)/(x2-x1)
I hope this helped its a little confusing yes