25-29 ok so first do 9-5 equals 4
Answer:
x=-5
Step-by-step explanation:
THe answer is, 
And in decemal form it will be, 
There are two ways to approach this.
Option #1:
Use the slope formula
.

That value is undefined, so the slope is undefined.
Option #2:
Because the two points have the same x-value, they will be vertically above/below one another. This means your line is a vertical line and the slope of a vertical line is undefined.
Either way, your slope is undefined.