Answer:
undefined
Explanation:
the equation for the slope of the line is (y2-y1)/(x2-x1)
here are the given points: (-6,-8) and (-6,12)
label the points:
x1=-6
y1=-8
x2=-6
y2=12
now substitute into the equation (m is slope)
m=(12--8)/(-6--6)
m=(12+8)/(-6+6)
m=20/0
m=undefined
the slope is undefined because you cannot divide by 0
Hope this helps!