How do i carry as a Support?

I know you can carry by playing support but in low elo (im silver) its really hard, 2 times i had midlaners that fed, lux that went 0-7 in 15 minutes and a ziggs that went 0-9 in 20 minutes, a warwick that goes 1-5 and he doesnt gank, doesnt help with dragon, its like they are not paying attention to the game at all, so please tell me how do i carry when me and my adc is doing fine but the enemy midlaner and jungler are so fed we can't do anything?
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