What is the slope of the line perpendicular to # y=4/7x+13#?
The word perpendicular mean that two lines intersect "cut" each other at a 90 degree angle.
Therefore both line have slopes that are negative reciprocal to each other
Negative meant- opposite in side
Reciprocal- "flip flop" aka invert the slope
From your question
We know the original slope if
Perpendicular slope is