Bell Atlantic will buy a Greyhound computer-equipment subsidiary, Greyhound Capital Corp., Greyhound announced . . . The House Energy and Commerce Committee approved legislation on a 22-20 vote to sell Conrail's stock in a public offering that could net the government more than $2 billion . . . Alaska Airlines' 450 pilots, who already agreed to one wage cut this year, have consented to another reduction of 8.63%, which will help save the company about $6 million annually . . . Federal prosecutors said they were unable to show why Miami Beach financier Victor Posner, who was convicted last July of evading $1.2 million in income taxes, should not receive a new trial.