you can put anything in the place of -1, but perpendicular to -2/3 is 3/2 so your new equation will be y= 3/2x-1 you can replace -1 with anything you like.
To find the perpendicular of other equations just flip the number so if it was 2/1 it would be 1/2 lets say its negative so, -1/3 it would turn into a positive but your numbers will still flip so it will be 3/1. If it is a positive 5/6 it will turn into -6/5. Hope these example and answer help!
