Linear Algebra. All systems will be solved by performing elementary row operations on an augmented matrix until it is transform into REF. Consider the following system: X1-X2-X3=1 , X1 X3=2 , X2 2X3=1 a)Write the system in the form Ax=b, b)Identify A, x, and b, c)"Solve" the system and "perform" show "each-all" elementary row operations d)Describe and "sketch" "draw it" "graphically" the system and your answer to part c.