Would acceleration on the y-axis and total mass on the x-axis be a Y vs X graph meaning the title could be acceleration vs total mass or would it be the other way around?

Answer 1

if it is acceleration vs total mass, then it would be:
acceleration is on the y-axis and total mass would be on the x-axis

if it was total mass vs acceleration, then it would be:
acceleration is on the x-axis and total mass would be on the y-axis