I need solution of these sums to be solved in 'MatLab'. Please answer will all the steps and code. URGENT! thanks

Problem #18 1 - 6x + x = 4 |x, 6x + x = 4 {x - 6x + x = 4 1. Solve the linear system using Thomes'algorithm: *14 2. Solve the equation cos(x + 0.4) + 1 = ln(x - 2) by the Newton's method (accurate to within E = 10-5). 3. Solve the Cauchy problem x?y"-xy'-2y = x +4 Inx, y(t) = 9,y'(1) = 7 on the interval (1,4). Plot the graphs of y(x) and y'(x)