please show the MATLAB CODE ALSO.

2 Lab Exercises on Linearity and Time Invariance Download the Matlab function called lab7systems from the course website. This function implements 5 different systems. Type help lab7systems at the command line prompt to see instructions for how to use it. This function takes a signal vector x and its associated time vector t as inputs and produces an output vector y. Your task is to analyze lab7systems to determine whether each of the 5 systems it implements are linear and/or time invariant. 1. Read the Matlab code for the function. Based on it, write a mathematical definition for each system. For example, here is a mathematical description of a system that adds 72 to the input signal x[n]: y[n] = x[n] + 72. 2. Define a set of test signals to use as inputs to determine whether these systems are linear and/or time invariant. A convenient test signal might be the square pulse x [n] = u[n] u[n - 5]. You can define this signal in Matlab as follows: n=-2:1:10 x1=(n>=0 & n=3 & n