Hello!
Perpendicular lines have slopes that are opposite reciprocals.
It means we take a number, flop it over and then make it negative.
So if we have 2, we flop it over:
![(1)/(2)](https://img.qammunity.org/2021/formulas/physics/middle-school/ukxexrkoplrwscaxd96qbbkphc5fo6w2ur.png)
Then, we make it negative:
![-(1)/(2)](https://img.qammunity.org/2021/formulas/mathematics/high-school/8sp5mxzbabg3z7q3l6ijsxgb4wuxxhht3u.png)
That is the slope. Hope it helps
If you have any query, please ask me! :)
~A forlorn girlie
![MagicalNature](https://img.qammunity.org/2021/formulas/mathematics/middle-school/hvybk9hza3upol4r2o5iobmi5nilvcufie.png)