chegg a. solve the linear systems by applying gaussian elimination to the augmented matrix ⎡ 1 −1 2 −1 . 6 1 ⎤ ⎢1 0−1 1. 4 1⎥. ⎣ 2 1 3 −4 . −2 2 ⎦ 0 −1 1 −1 . 5 −1 b. solve the linear systems by finding and multiplying by the inverse of ⎡1−1 2−1⎤ a