From the graph above we can conclude that if one system is positive then the system will be unstable.
Why can not stabilized ???
The system is unstable if the input value is finite and have infinite output,
otherwise stable system input value is equal to or close to the value of output
otherwise stable system input value is equal to or close to the value of output
from the graph can be seen the output value increase when t getting bigger.
By : Group 2