You can't 1v2 without help because the enemy can call its junlger for a dive, and 1v3 is almost a guaranteed kill if the enemies know what they're doing.
Before the dragon update, in coordinated games, 1v2 lanes existed when the bot lane switched with top lane to let their scaling adc's farm (like vayne) or before the tower update, teams wanted to take down towers fast for money ("we can take down your top tower before you take down our bot tower" or "let's each trade a tower and avail everyone to more early gold" meta).
For the "scale the weaker adc" meta, the jungler would exclusively help out the solo lane hold off the tower.
For the early tower meta, junglers would go to where the support and adc are, and take the tower quickly because that was more efficient. The solo laner would have to only get experience from afar (champions like kennen farming with shuriken and maokai farming with sapplings). The solo lane champions then switch lanes and start farming in the lane without t1 tower).
TLDR: no you can't.