Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 77
ij + BX-1 = x + 2.-:^ (b) r — 1 x-3 2 3 (e) y^ = S. (d) aLzil=2x_pi 60 LOCI AND THEIR EQUATIONS [Chap. IV. 6. Write the equation of each of the lines in exercise 5 in the interceptform. In the slope form. 49. The ellipse. A point moves so that the sum of its distancesfrom tivo fixed points F and F^… … M c Fig. 37 2 a units in length (Fig. 37). Take C, any point on A^B^, andwith A^C as radius describe a circle about F. With CB^ as radiusdescribe a circle about F^. The two circles meet in the points 3fand iV. These points are on the locus, since the sum of the radii ofthe two circles is 2 a.…
Geometry, Analytic
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