Answer:
λ =--9
x=3
y=3
Step-by-step explanation:
3x+λ=0
3y+λ=0
x+y-6=0
Taking sum of first two equations;
3x+3y+2λ=0
3(x+y)+2λ=0 ---(a)
multiply third equation by 3
3(x+y)-18=0 ----(b)
Subtracting eq a from eq b
==> 2λ+18=0
==> λ = -9
Putt this value of λ in 3x+λ=0
==> 3x-9=0
==> x=3
Again put value of λ in 3y+λ=0
==> 3y -9=0
==> y=3