Respuesta :

The opposite reciprocal of -1/9 is 9
So the answer is A
JeanaShupp

Answer: A. 9

Step-by-step explanation:

Given: The red line and the green line are perpendicular to each other.

The slope of green line =[tex]\dfrac{-1}{9}[/tex]

We know that the product of slopes of two perpendicular line is -1.

Let m be the slope of red line ], then we have

[tex]\dfrac{-1}{9}\times m=-1\\\\\Rightarrow\ m=\dfrac{9}{1}=9[/tex]

Hence, the slope of the red line = 9.