Answer:
Undefined slope, vertical line
Step-by-step explanation:
Slope = [tex]\frac{y_{2} -y_{1}}{x_{2}-x_{1}}[/tex]
Slope = [tex]\frac{-7 -(-9)}{-9-(-9)} = \frac{-7+9}{-9+9} =\frac{2}{0}[/tex] = Undefined
Since the slope is undefined, you would have a vertical line.
