- Finding the coordinate that yields a given slope
The points (2,r) and (6,-2) lie on a line with slope -3/4 Find the missing coordinate r.

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m