. Let (x1, y1) and (x2, y2) be two distinct points in the plane.Prove thatx y 1x1 y1 1x2
Chapter 5, Problem 77(choose chapter or problem)
. Let (x1, y1) and (x2, y2) be two distinct points in the plane.Prove thatx y 1x1 y1 1x2 y2 1= 0gives an equation for the line passing through (x1, y1) and (x2, y2).
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