Answer:
undefined
Explanation:
slope = change in y / change in x
Let's take change as (second point) - (first point). We could do (first point) - (second point), but we have to choose one
slope = (y₂-y₁)/(x₂-x₁)
= (7/7)/(0)
= 1/0
Anything divided by 0 is undefined, so the line has no slope/is undefined