How to win the "1v5" type of games

I've recently had too many games where at least a lane was failing hard, making it impossible for me, as a mage player to sustain all of them, roam everywhere. ADC is dealing no damage, top lane Urgot is 0/8 and afk, diamond Thresh main unable to hit a single hook and Zac jungle is clueless of what to do or aware of what his abilities do. It is not fun and just a waste of time, I have no idea what to do in such conditions and I have not had a single game like this that I won in the past. Any advice on such conditions would be greatly appreciated.
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