The diagram being analogous to that of § 14,where the axes are rectangular, by similar trianglesTXA, BOA, y _(t-xb a = 1--;a or - + ^ = 1,a 0 which is the equation required, the form being thesame as when the axes are rectangular. The Straight Line. 71 (2). To find the equation of a straight line… … The dia^am and notation being analogous to that of§ 15, where the axes are rectangular, by similar triangles^-^1 _ y-Vi which is the equation required, the form being thesame as when the axes are rectangular. (3). The general equation of the first degree, Ax + By+ C=0, always represents a straight…
Geometry, Analytic
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