Question 80256
First lets find the slope through (0,5) and (-3,-4)


*[invoke slope 0, 5, -3, -4]


Now to find the perpendicular slope, we simply invert the orginal slope and negate it like this

{{{m[p]=-1/m}}} where {{{m[p]}}} is the perpendicular slope

{{{m[p]=-1/3}}}


So the perpendicular slope is 


{{{m=-1/3}}}