2. Solve the system of equations using Gaussian elimination by following the steps below. 3x + 3y+5z = -23 x-3y+4z-21 -x-5y = -3 Step 1. Write the system as an augmented matrix. (1 point) Step 2: Use row operations to get 1's in the main diagonal. Indicate the row operation you choose for each step. (4 points) Copyright 2019 Michigan Virtual Revised6/4/2020 Page 2 M MICHIGAN VIRTUAL Precalculus B | Unit 15 Test Part 2 (14 points) 1 5 -4 1. Find the inverse of matrix A = 0-7 2 by following the steps below. 2-6 7 Step 1. Write the identity matrix next to matrix A as shown in lesson 15.3. (1 point) [] Step 2: Use row operations to turn the original matrix A into the identity matrix. Indicate the row operation you choose for each new matrix you write until the original matrix on the left becomes the identity matrix. The matrix on the right will then be the inverse matrix A-1. (5 points) _