Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 67
ed. 49 50 ANALYTICAL GEOMETRY 1 20. Condition for three coUinear points. The line tlnouglithe points X ij 1 x^ y^ 1 = 0. ^3 ^3 1 (x^, 7/^), (x„ 2/3), is Now, if the point (x^^, y^ lie on this line, we have ^1 Ih 1 ^2 ^2 1^3 ^3 1 = 0, which is the condition that the three points (x^, y^, (x^,…
Geometry, Analytic
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