Answer:
The slope is undefined
Step-by-step explanation:
x = c , where c is any real number, is a vertical line.
Slope is defined as (change in y)/(change in x).
On the x-y axis, with a vertical line, there is no change in the x value, so the change in x equals zero. So you have...
(change in y)/0
You can't divide by zero, so we say the value is undefined.
x = 6 means that all x values for this line are 6. So only the y values change
