Given the system of equations: X1 + 2x3 = -7 2x, - xy + 2x3 = 10 3x1 + x2 = -5 (a) Write the system in matrix format: Ax = b (b) Write the augmented matrix of the system. (C) Find the row-echelon form (ref) of the augmented matrix using Gauss elimination. (d) Use back substitution to find the solution x. (e) Use Gauss-Jordan elimination to find the reduced row-echelon form (rref) of the augmented matrix and determine the solution x. ( Verify your solution by hand and using in MATLAB.

Write a function so that the main0 code below can be replaced by the simpler code that calls function mphandminutes tomiles0. original main0 int main) l double milesperhour-70.0; double minutestraveled = 100.0; double hourstraveled; double milestraveled; hourstraveled = minutestraveled / 60.0; milestraveled = hourstraveled * milesperhour; cout < "miles" 2 using namespace std; 4 /* your solution goes here/ 6 int maino 1 test passed 7 double milesperhour 70.0 all tests passed 8 double minutestraveled 100.0; 10 cout < < "miles: " < < mphandminutestomiles(milesper-hour, minutestraveled) < < endl; 12 return 0; 13