Osgood, William F. (William Fogg), 1864-1943, Graustein, William C. (William Caspar), 1888-1941, joint author · New York : The Macmillan Company · leaf 271
- 3, or 15(2/ - iV5)2 ^ 2V5(aj + f V5), or, finally, as (9) 152/2 = 2V5aj,where (10) K2/) = (-iV5,iV5) has been introduced as new origin of coordinates. It follows from (9) that equation (8) represents a parabola with its vertex at the new origin (10) and with its axis inclined at an angle of 153°… … Fig. 6 X 2x + y V5 x-2y and then the values for x, y given by (10). We obtain, asthe desired coordinates, (x, y) = (l, — 1). We return now to the general case, li d=^0, equation (7)represents a parabola; cf. Ex. 16, § 1. If d = 0, (7) can bewritten in the form(11) y^ + 2ky = l, EQUATION OF THE…
