The two subs both scored and assisted in the game, the first time two players had ever come off the bench for the same side in a Premier League game and both notched a goal and assist.
The former Borussia Dortmund forward completed his epic brace at stoppage time after being perfectly set up by Ramsey.
Arsenal, who have not enjoyed such a lengthy winning streak in 11 years, were sent on their way by two unerring finishes from Alexandre Lacazette - either side of an Andre Schurrle equaliser. The Gunners are third in the Premier League table with 18th points.
It seemed unlikely after their back-to-back losses to City and Chelsea at the start of the season, but Arsenal are now only a point behind the champions and Liverpool, who meet at Anfield later on Sunday.
"They are at a big level in the matches and every player wants to play".
The Gunners are growing in confidence under Emery and are undoubtedly on track for a top-four challenge, while Lacazette's form comes as a major plus.
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"Arsenal showed their quality and pace, but we surrendered in the last 10 minutes".
Lacazette is flying under Emery this season and scored with his first two shots on target of the match at Craven Cottage.
It was a significant statement of intent from a team widely written off ahead of Emery's first season in charge.
And don't look now, but Arsenal has won nine games in a row under Unai Emery and are flying high.
Twitter reacted to Arsenal's victory and here are some of the best tweet. "We will try to keep focus and continue to win games".
After the global break, Arsenal resume their Premier League campaign at come against Leicester City on October 22, before a Champions League clash away at Sporting Lisbon and a London derby with Crystal Palace.
Pierre-Emerick Aubameyang registered the assist, as he centred for Ramsey, with the Wales International allowing the ball to come through his legs before flicking it into the bottom corner in style.