Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 67
OA = a, OB = b.P (x, y) is any point on the line.OB _DPOA~DA*b y Now, by similar A, whence, a a — x (1) THE STRAIGHT LINE 51 This equation may also be found thus: Since the linepasses through tlie two points {a, o), (o, b), its equation, by thepreceding article, is X y 1 a 0 1 =0; obi whence, X II…
Geometry, Analytic
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