1. What is Gaussian Elimination with backward substitutions?
Explain your answer by solving this problem using the following equations:
x + y = 3
3x -4y = 2
2.  After explaining the Gaussian elimination, use MATLAB to solve the same  problem above by creating matrix A and B from the equations:
x = inv(A) * B  
or 
x = AB
Copy and paste in the edit window to SHOW ALL YOUR Work.