Arsenal manager Mikel Arteta to BBC Sport: "After the break, we started saying we had to start closing the gap on the top teams and turn draws into wins. Today was the first opportunity and we've done it. All good.
"I'm so pleased for Laca [Alexandra Lacazette] - the reaction of the players and staff towards him. He fights hard for everyone. He's been unlucky. He will gain confidence from this and knows how everyone appreciates him."
Arsenal captain Pierre-Emerick Aubameyang speaking to Sky Sports: "We started not at our best but in the second half we put some more energy in and we scored the goals.
"We spoke at half-time and the coach told me to stay as a second striker and take my position off Eddie [Nketiah]. They were playing very deep and compact so it was good for us to have me in the middle to give more space out wide."
Newcastle boss Steve Bruce speaking to Sky Sports: "The disappointing thing is the goals we gave away are not like us. They were too easy. For an hour we were where we have been all season. We switched off from that and gave away sloppy goals.
"I was delighted with the way we played in the first half. We made the wrong pass or selection when we [attacked]. The second half, we knew they would come with more intensity and we didn't start well.
"We've played well enough in the first half - we have to try and keep to those levels but we didn't get anyway near it in the second half. When you get a beating as you have, you have to lick your wounds and get on with it."