broken pressureplate or slave cyln

My car problems all started last friday... I noticed the clutch pedal getting harder to push in and when i switched into some gears with the clutch floored the gears would still grind. anyway i managed to get to work and back without any problem. But the very next day i got in my car i made it about 1/3rd of the way to work noticing the pedal pressure slowly fading away. My question is this - is there something wrong with my clutch assembly or my clutch line? my line isnt leaking but could it be the slave cylynder