3. [10 points) Write a short script that solves the following system of linear equations using Matlab's matrix manipulation and inversion capabilities. b = 211x +212 +2132 b2 = 221x + 2 y + z. Z by = 231+ 32 +33 Z Assume you have a variable b that contains the knowns in the left hand side and a variable A that contains the coefficients ay in the right hand side and write the short script that finds the unknwons x, y and z. 4. [15 points) Write a simple Matlab script that plots the following piecewise defined function xso f(x) = 0 2 x-1 The plot should be between -1 ...3, have 150 points and be done without a for loop or if elseif else conditional statements