Viktor Gyokeres scored his first Arsenal goals as the Gunners put five past Leeds after unveiling new £60m signing Eberechi Eze before kick-off.
It was a jubilant atmosphere in north London as Eze was introduced to the crowd before the game and the energetic crowd seemed to give the team a lift.
Jurrien Timber scored the opening goal, heading in a trademark set piece before providing an assist for Bukayo Saka for Arsenal’s second.
Saka smashed a shot past Lucas Perri just before half-time but then the England winger was forced to limp off injured in the second half.
Striker Gyokeres, a £64m signing, jinked into the box to score Arsenal’s third with a low strike before Timber scored his second from another corner.
Mikel Arteta also handed a Premier League debut to 15-year-old Max Dowman, who replaced Noni Madueke, who had been making his first start for the Gunners.
In other games played, Josh Cullen and Jaidon Anthony were on target as Burnley beat Sunderland in a battle of two newly-promoted sides at Turf Moor.
Clarets skipper Cullen scored the first after collecting the ball on the edge of the box following a clever flick from Anthony, curling a low shot into the far corner two minutes after half-time.
Anthony then raced onto Cullen’s pass and rounded the goalkeeper to double the hosts’ lead and make sure of the win late on.
After a 3-0 defeat at Tottenham in last weekend’s opening game of the Premier League season, Scott Parker’s side have their first points on the board.
Meanwhile, Dango Ouattara scored on his debut as Brentford earned their first Premier League win of the season with a gritty performance against Aston Villa.
Burkina Faso international Ouattara joined Brentford for a club record fee of £42.5m from Bournemouth a week ago and settled this match with a composed 12th-minute strike.
The result also ensured new Bees head coach Keith Andrews secured three points in his first home league game, having succeeded Thomas Frank in charge at Gtech Community Stadium.
Also, a deflected Marcus Tavernier strike was enough to earn Bournemouth their first Premier League win of the season and condemn 10-man Wolves to a second straight defeat.
