Question

FIND THE SLOPE OF A LINE PERPENDICULAR TO THE LINE THAT PASSES THROUGH THE FOLLOWING POINTS
(3,9) AND (7,15)

Answer 1

Take the negative reciprocal of the slope.

http://www.algebralab.org/lessons/lesson.aspx?file=geometry_coordparallelperpendicular.xml

Answer 2

The subject is not physics

Answer 3

straight pipe