1. Creating a user-defined function Write a user-defined MATLAB function named PBTaskapt t.m for the following math function with x the input argument and y the output y(x)-0.8x-13x-5x The function should work for x being a scalar or a vector Write a script file named PBTask4p1.m to Use the function to calculate y(3) and y(5) and display the results in command window Use the function to make a plot of the function y(x) for -5sxs 5. Label the x-axis and y-axis of the plot like the one as follows. a) b)