A dynamic system model is given as

where \(u(t)\) is the unit step. Plot \(x_{1}\) versus \(0 \leq t \leq 15\) by

a. Using the lsim command.

b. Simulating the Simulink model of the system.

2x1+x-(x2-x) = u(t) [x2 + x2 + (x2 x) = u(t)' x(0) = 1, x2(0) = 0, x(0) = }