Answer:
-1
Step-by-step explanation:
To calculate slope:
m=[tex]\frac{rise}{run}[/tex]=[tex]\frac{y_{2}-y_{1} }{x_{2} -x_{1} }[/tex]
([tex]x_{1}[/tex] and [tex]y_{1}[/tex])= coordinates of the first points in the line
([tex]x_{2}[/tex] and [tex]y_{2}[/tex])= coordinates of the second points in the line.
So slope =
[tex]\frac{9-8}{1-2}[/tex]=[tex]\frac{1}{-1}[/tex]
1 divided by -1 is -1
HOPE THIS HELPED
