तलों `ax+by+cz+d=0` और `ax+by+cz+e=0` के बीच की दूरी ज्ञात कीजिए ।

If pqrne0 and the system of equations (p + a) x + by + cz = 0 , ax + (q + b)y + cz = 0 ,ax + by + (r + c) z =0 has a non-trivial solution, then value of (a)/(p) + (b)/(q) + (c )/(r ) is a)-1 b)0 c)1 d)2

Add : 9 ax , + 3 by - cz , - 5 by + ax + 3 cz

The equation of the plane through the line of intersection of planes ax + by + cz + d=0 , a 'x + b'y + c'z + d' =0 and parallel to the lines y =0 and z=0 is

> ax + by + cz = Ohere, n1.n2 = 0