I think that the first endgame is win, also if it's very hard to win.
Usually with only a passed pawn is draw, in the game you can go with the pawn "g" and "e" , so the black has good chance to win.
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I think that the second is draw, the idea for the white is threating e4, so the black king must stay on b5. To understand if this endgame is draw or not, we must count the tempos. The white must force Kc6 of the black and the game is an easy draw.
i have 2 positions that i'd like to hear your opinions about . are these positions win ,lose or draw ? i won the first one from time and lost the second one ,my end game knowledge is very lacking