6.C 7.D 8.A
Harshal Patil last edited by Harshal Patil
6th solved using cramers rule... as x=delta(x)/delta
So for unique soln delta shud be non zero...
7th: i hav solved manually for infinite solns...
after finding lambda=1
I hav solved
(iii)-(ii) and (iii)+(ii)-(i)
(i),(ii),(iii) are respective eqns.
8th: delta shud be zero and at least one of
delta(x),delta(y),delta(z) shud be non zero
I hav solved very briefly so im attaching theory as well: