Determine whether the following system represented by input output relation is stable and causal:

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ะŸะพะบะฐะทะฐั‚ัŒ ะพะฟะธัะฐะฝะธะต
(VTU Model QP)
๐’š[๐’]=๐’™[๐’+๐Ÿ]+๐’™[๐’]+๐’™[๐’โˆ’๐Ÿ]
๐’š[๐’]=๐Ÿ๐’™[๐’+๐Ÿ]+๐Ÿ‘๐’™[๐’]โˆ’๐’™[๐’โˆ’๐Ÿ]
๐’‰[๐’]=(โˆ’๐ŸŽ.๐Ÿ“)^๐’ ๐’–(๐’)
ะ ะตะบะพะผะตะฝะดะฐั†ะธะธ ะฟะพ ั‚ะตะผะต