CREATE TABLE table_name_75 (home_team VARCHAR, date VARCHAR, away_team VARCHAR)

Who is the home team on 31 January 1951 when away team was Sheffield United?
SELECT home_team FROM table_name_75 WHERE date = "31 january 1951" AND away_team = "sheffield united"
SELECT "home_team" FROM "table_name_75" WHERE "31 january 1951" = "date" AND "away_team" = "sheffield united"