AMU Engineering 2020 solved paper Solved Paper

The coordinates of A and B are (0,b,c) and (a,0,c) respectively. The equation of a plane passing through O(0,0,0), is
Px+Qy+Rz=0 . . . (i)
It passes through A and B
∴‌‌P×0+Q×b+R×c=0
‌ and ‌P×a+Q×0+R×c=0
⇒‌‌‌‌‌

P

bc

=‌

Q

ac

=‌

R

−ab

Substituting the values of P,Q and R in Eq. (i), we get
bcx+acy−abz=0