my sink is very slow to drain, the washing machine is hooked...

my sink is very slow to drain, the washing machine is hooked up 2 ft away from kitchen sink, also across the house i have a tub that takes a while to drain oh and the toilet doesnt flush to well. i got on the roof and stuck my fish tape down the vent at the kitchen sink, it felt like i went thru a 90 and then stopped i pulled it out and there was a ball of roots. my pipes are cast iron. wtf? i dont wanna dig a tunnel

i think its time to call a pro. they have the tools needed including a camera that they send down to look inside the pipe.