Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 75
UATIONS [Chap. IV. slope of segment 1\P = slope of segment P1P2.But (Art. 11), slope of FyP = -^^^, and slope of P.P^ = ^ ~ ^^ Therefore 2/- 2/1 _ 1/2-2/1 (1) iC — if 1 iCg — a?i The expression ^-~ ■^^ is called the slope of the line. Eepresent- 1 m. ing the slope of the line by m, equation (1)… … reduces to ^2(3:2,y 2) a b (4) ^x Fig. 36 Equations (1), (2), (3), and(4) are all standard forms ofthe equation of a straight line.Equation (1) is called the two-point form, equation (2) is theslope-point form, equation (3) is the slope form, and equation (4) isthe intercept form. From these…
Geometry, Analytic
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