Question

The lines shown below are perpendicular. If the green line has a slope of

Answer 1

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 =$\dfrac{-1}{9}$

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

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

$\dfrac{-1}{9}\times m=-1\\\\\Rightarrow\ m=\dfrac{9}{1}=9$

Hence, the slope of the red line = 9.

Answer 2

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