Answer:
0
Step-by-step explanation:
Okay, so the formula is [tex]\frac{Rise}{Run}[/tex] but since you do not have a graph you can use the formula: [tex]\frac{Y_{2}-Y_{1} }{X_{2}-X_{1} }[/tex].
Plug in the numbers.
[tex]\frac{9-9}{9-(-1)}[/tex]
[tex]\frac{0}{10}[/tex]
So, it would be 0.
0÷10=0
