Hello im trying to do a Lagrange multipliers problem with 2 constraints. I get 4 equations..

2*x-lambda2*x - u = 0

2y-6-lambda- u =0

y+x^2 -4 =0

y+x-2=0

so then i solve and i get x=2,y=0, x=-1, y=3 .. So then i solved for equation 2 and got .. = u = -lambda. Now what do i do is this even right so far?