Answer:
- 1
Step-by-step explanation:
Let the slope of one line be 's' , then according to the given condition that the slope of second line is negative reciprocal of the first , We obtain the slope of the second line as [tex]\frac{-1}{s}[/tex].
So, the product of both the slopes is given by [tex]s\cdot \frac{-1}{s}=-1[/tex]
This shows that whatever the slopes may be if they are negative reciprocal of each other then their product will always be -1