A martix has no soln when → $ {(Adj A).B} / |A|$ = x / 0 as answer. where x CANNOT be 0, If x=0 then we can have ininite solutions
|A| = Co-efficients of the variables of the equation
|A|=
Now |A| = 0 only when a=3.
And (Adj A) =
and B = Values on the RHS of the equations
B=
Now ( Adj A). B is NOT 0 when b=9 but it becomes 0 when b = 6. Now as 6 ϵ R so, b ϵ R is NOT POSSIBLE.
So ans is A. a=3, b=9