How far must a circular piston with diameter 4.0 cm be pushed down into one cylinder of a hydraulic lift to raise a circular piston of diameter 12.0 cm by a distance of 36.0 cm

Alinear relationship would look like a straight line on the graph. it could have a positive negative or 0 slope. so it could be a line potentially going in any direction but it must be perfectly straight.

That would be kinetic energy

Inner peace.. jk it's  a stable electron configuration

An adiabatic process is one which occurs without the transfer or matter or heat in a system.