Answer:
infinite
Explanation:
We need to find the slope of the line passing through the points (6,6) and (6, -7).
The slope of a line can be calculated as the formula as follows :

We have,
x₁ = 6, y₁ = 6, x₂ = 6 and y₂ = -7
Put all the values,

So, the slope of the line is equal to infinite.