Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 80
IGHT LINE 63 (2) Place Then whence The equation of the required line is then or x + 18 y + 2 = 0. 33. Distance of a point from a straight line. Let LK (fig. 70)be a given straight line with the equation 0, C: Ax+By and let Pl(xl, y^) be a given pointlength of the perpendicular J^Edrawn from 1\ to… … Axx+By%+C=0, Fig. 70 whence Then OT-Jfi-Jf, J./-, + />//, + (? It is clear that this expression is a positive quantity when(xlt y^) lies above the line LK and is a negative quantity when(x^ y^) lies below ZA. It is also evident from the triangle T[QB,and from a like triangle in other cases, that…
Geometry, Analytic · Calculus
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