Complete either #3 or #4. Label your work and show all work necessary to support your answer. (3 points total) 3. Suppose you wanted to solve the following system of equations, 2v+ w+ x- 2y+7= =2 8v+5w+6x-3y-z=3 -v+2w+3x-9y+2z=-6 3v +4w-x+y+3z=-9 V-7w-4x -6y+z=12 a. Write the augmented matrix corresponding to this system. b. Begin Gaussian elimination to rewrite the first column only of this augmented matrix. (Do not proceed past the first column.) Show all elementary row operations necessary (using subscript notation) c. If done correctly, the system corresponding to your matrix from part b is equivalent to the original system. What does this mean? Be clear and specific