Question

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

-1/9 , what is the slope of the red line?
A. 9
B. 1/9
C. -9
D. -1/9

Answer 1

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

Answer 2

Answer: A. 9

Explanation:

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

The slope of green line =
`(-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

`(-1)/(9)* m=-1\\\\\Rightarrow\ m=(9)/(1)=9`

Hence, the slope of the red line = 9.