The perpendicular distance from 1,3  to the line passing through the point P2,1 where the point P2,1 bisects the portion of the line intercepted between the axes.

The equation of the line whose portion intercepted between the axes bisected by x1,y1 is xx1+yy1=2 Hence the equation of the line whose portion intercepted between the axes at P(2,1) is x2+y=2 Rewrite the equation as x+2y−4=0 The perpendicular distance from a point Px1,y1 to the line ax+by+c=0 is ax1+by1+ca2+b2 The perpendicular distance from a point (1,3) to the line x+2y−4=0 is 1+23−41+4=35=355