John Drew and Eddie Johnson each contributed 25 points and the Atlanta Hawks, fired up by the ejection of Coach Hubie Brown, roared back in the second half tonight to defeat Houston, 100-91, for a two-game sweep of their first-round NBA playoff series.

The Hawks, who now face defending NBA Champion Washington in a best-of-seven series starting Sunday afternoon in Capital Centre, trailed, 58-52, at the half after Brown was kicked out of the game with 3:23 remaining. He had gotten his second technical foul within 16 seconds.

Atlanta, which has won 17 consecutive home games, battled back to tie the game at 78 after three periods, then dominated the Rockets in the fourth quarter.

Houston, which lost the opener at home Wednesday night, 109-106, trailed by three with 8:05 to play. But the aggressive Hawk defense held the Rockets scoreless for 5 1/2 minutes while Atlanta scored 11 points for a 96-83 lead.

Johnson scored 17 points in the first period. Hot-shooting reserve Terry Furlow scored 12 of his points in the second half, with four in the 11-0 spurt.

Houston, which scored only 13 points in the fourth quarter, was led by center Moses Malone with 21 points. But Malone was shut out in the final period.

Brown was ejected by referee Earl Strom with the Hawks trailing 50-46. The Rockets reeled off seven unan swered points for their biggest lead of the night, 57-46, and carried a six-point lead into the dressing room.

Furlow, acquired from Cleveland prior to the all-star break, got the Hawks even after three periods by tossing in two long jumpers in the final minute.

The teams swapped the lead before Atlanta went ahead to stay, 83-81, on Furlow's 25-footer with 9:02 remaining. The Hawks outscored the Rockets, 15-2, during the next 6 1/2 minutes.

The Rockets had outscored Atlanta, 8-2, at the beginning of the second period to take a 35-33 lead on a pair of free throws by Dwight Jones. They built the 11-point margin on a Calvin Murphy jumper with 2:14 left in the half.

The Hawks whittled Houston's margin at halftime on baskets by Tom McMillen and Wayne Rollins in the last 50 seconds.