The length of the distance from the point Pa,b,c from x-axis isb2+c2Hence, k=32+42=5The given points are6,2,5,1,−3,0The direction ratios of the line joining the points Ax1,y1,z1and Bx1,y1,z1 isx2−x1,y2−y1,z2−z1Therefore, the direction ratios of the line joining the points 6,2,5,1,−3,0  is −5,−5,−5=1,1,1