I have a tip for you [Low elo players only]

This is just from my experience and it sort of works if your team is capable of taking opportunities you give to them and if the enemy is dumb enough to take the bait. See what I've noticed playing in lower elo is that there's A LOT of premades with 1 player who generally does too well for the rank he's in and a bunch of shit players who were clearly carried by this player.

Being a jungler I get to roam around quite often and notice things such as how different lanes preform and how they react to aggression. See when you spot the high skilled player in a premade make sure to always avoid him, starve him of kills and just leave him isolated to farm away in a lane alone, thats step one.

Step two is finding the player being carried. Once you do start focusing them, and by that I mean make their life a living hell. Camp their lane, tp over and kill them, roam from mid and nab a kill off them, generally just keep harassing them until they tilt. That will usually throw the skilled player's focus on his lane/objective off and make him direct his attention on them or more importantly on you leaving a blind spot for the rest of your team to utilize on

This won't work if there's more than 1 skilled player in the premade or if your teammates are a bunch of idiots.

Good luck.[slayer-pantheon-thumbs]