Osgood, William F. (William Fogg), 1864-1943, Graustein, William C. (William Caspar), 1888-1941, joint author · New York : The Macmillan Company · leaf 298
are on the sameside of the line Li:Fi = 0 asthe origin ; similarly, the pointswhose coordinates satisfy (2)are all the points which are onthe opposite side of the lineL2F2 = 0 from the origin.The points whose coordinatessatisfy (1) and (2) are the points common to these two sets, namely, those of… … Fig. 9 li^2>0; II f F, > 0, III F,<0; IV f F, < 0,Fo>0. 280 ANALYTIC GEOMETRY Example 2. Find the points satisfying simultaneously the inequalities: ?/2-2a? < 0, x + y -1 <0. The equations obtained by replacing the signs < by signs ofequality represent a parabola and a line…
