Why does Linda tell the boys, "Get out of here, both of you, and don't come back!"?

Oblivious to Willy's deep suffering, Biff and Happy earlier abandoned their father at Frank's Chop house where they were all having dinner together.What Linda doesn't know is that without his sons, especially Biff, Willy has nothing. And with his sons, especially Biff, Willy has to face the lies that make up his life. So Willy just can't go on. There is no solution; she can't kick Biff out, and there's no way he can stay. Her husband is hopelessly doomed.